Bibliografie tematiche / Geotechnical correlations

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Letteratura scientifica selezionata sul tema "Geotechnical correlations"

Autore: Grafiati
Pubblicato: 22 febbraio 2025

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Articoli di riviste sul tema "Geotechnical correlations"

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Eslami, Abolfazl, Masoud Nobahar e Mohammad Esmailzade. "Static and Dynamic Cone Penetrometer Tests for Babolsar Sand Parameters via Physical Modeling". Geotechnics 4, n. 3 (22 settembre 2024): 966–84. http://dx.doi.org/10.3390/geotechnics4030049.

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Field tests are the most suitable method to determine geotechnical parameters. Owing to some restrictions in field tests, physical modeling has been widely accepted as a proper method to define mathematical correlations among geotechnical parameters. This study investigates correlations between parameters derived from cone penetrometer tests. The tests were performed in a cylindrical chamber with a height and diameter of 1000 mm to minimize the boundary effect. Coastal poorly graded sand sampled from the Babolsar region, adjacent to the Caspian Sea, was used. Some correlations among geotechnical parameters, including cone resistance, dynamic cone resistance, dynamic penetration index, modulus of elasticity, internal friction angle, and relative density, are presented. All correlations were categorized into three main categories: soil stiffness, penetration strength, and geotechnical parameters. The results had reasonable accuracy and precision. The average R2 value of the obtained results was approximately 94. The investigations into the inherent CPT also indicated that the strength parameter had more accuracy than stiffness and other sand parameters. Specifically, the R2 value for the correlation between the results of various penetration tests, considered strength parameters, averaged 97. In contrast, the R2 value for the correlation between the elasticity modulus and cone penetration test results was 86.
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Rezaei, Sadegh, Issa Shooshpasha e Hamed Rezaei. "Empirical Correlation between Geotechnical and Geophysical Parameters in a Landslide Zone (Case Study: Nargeschal Landslide)". Earth Sciences Research Journal 22, n. 3 (1 luglio 2018): 195–204. http://dx.doi.org/10.15446/esrj.v22n3.69491.

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Today, geotechnical and geophysical techniques are used for landslide evaluation. Geotechnical methods provide accurate data, but are time consuming and costly. Geophysical techniques, however, are fast and inexpensive, yet their accuracy is lower than that of the geotechnical methods. Therefore, simultaneous use of geotechnical and geophysical methods provides a suitable solution for landslide evaluation. Availability of geotechnical and geophysical data makes it possible to investigate correlation between different parameters. Correlating geotechnical and geophysical parameters ends up lowering field investigation costs and enhancing subsurface survey speed in a landslide zone. In the present study, in order to evaluate Nargeschal landslide in Iran, ambient noise measurement, ERT survey, and geotechnical investigations were used. Once finished with data processing, the data obtained from geotechnical and geophysical investigations were correlated. These included SPT-N – electrical resistivity, soil moisture content – electrical resistivity, and SPT-N – shear wave velocity correlations. The correlations were examined using two methods, namely Spearman’s coefficient test and least square regression analysis. The results obtained from the two methods were in good agreement with one another. The correlations obtained in this study were of moderate to very strong strength and fell in the range of the results of previous studies. Investigation of the results indicated significant influences of ground water on electrical resistivity and soil stiffness on shear wave velocity. Results of this study can be used for soil classification and determination of mechanical and seismic characteristics of soil across various areas.
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Salih, Nihad Bahaaldeen. "Geotechnical characteristics correlations for fine-grained soils". IOP Conference Series: Materials Science and Engineering 737 (6 marzo 2020): 012099. http://dx.doi.org/10.1088/1757-899x/737/1/012099.

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Peng, Ming-Qing, Zhi-Chao Qiu, Si-Liang Shen, Yu-Cheng Li, Jia-Jie Zhou e Hui Xu. "Geotechnical Site Characterizations Using a Bayesian-Optimized Multi-Output Gaussian Process". Sustainability 16, n. 13 (5 luglio 2024): 5759. http://dx.doi.org/10.3390/su16135759.

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Geotechnical site characterizations aim to determine site-specific subsurface profiles and provide a comprehensive understanding of associated soil properties, which are important for geotechnical engineering design. Traditional methods often neglect the inherent cross-correlations among different soil properties, leading to high bias in site characterization interpretations. This paper introduces a novel data-driven site characterization (DDSC) method that employs the Bayesian-optimized multi-output Gaussian process (BO-MOGP) to capture both the spatial correlations across different site locations and the cross-correlations among various soil properties. By considering the dual-correlation feature, the proposed BO-MOGP method enhances the accuracy of predictions of soil properties by leveraging information as much as possible across multiple soil properties. The superiority of the proposed method is demonstrated through a simulated example and the case study of a Taipei construction site. These examples illustrate that the proposed BO-MOGP method outperforms traditional methods that fail to consider both types of correlations, as evidenced by the reduced prediction uncertainty and the accurate identification of cross-correlations. Furthermore, the ability of the proposed BO-MOGP method to generate conditional random fields supports its effectiveness in geotechnical site characterizations.
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Salih, Mustafa Musa, Faris Waleed Jawad, Abbas Fadhil Ibrahim Al-Ameri e Ali A. Abdulhameed. "Geotechnical correlations of soil properties in Hilla City – Iraq". Open Engineering 12, n. 1 (1 gennaio 2022): 729–42. http://dx.doi.org/10.1515/eng-2022-0335.

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Abstract In this research, the geotechnical properties of the soil profile in Hilla city within Babylon Governorate in the middle parts of Iraq are described. The geotechnical data at the specific sites were collected from some geotechnical investigation reports performed at some selected locations. This article is devoted to studying the distribution of soil properties (the physical and mechanical) in the horizontal and vertical directions. Moreover, a correlation between different physical and mechanical properties is performed. The correlation is executed using statistical analysis by Microsoft Excel Software (2016). From the regression results, it was found that the nature of the soil is cohesive up to 15 m under the natural ground level, and the soil will change to noncohesive. The new line in the plasticity chart has been drawn parallel to A-line especially for the investigated region, the shear strength parameters depend on the consistency of the soil and the depth, and finally, there is a direct correlation between mechanical and physical parameters. Using these correlations with some available information help to predict the value of shear strength and consolidation parameters.
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Sanou, Amande-Gaston, Ali Saeidi, Shahriyar Heidarzadeh, Rama Vara Prasad Chavali, Hamza Es Samti e Alain Rouleau. "Geotechnical Parameters of Landslide-Prone Laflamme Sea Deposits, Canada: Uncertainties and Correlations". Geosciences 12, n. 8 (30 luglio 2022): 297. http://dx.doi.org/10.3390/geosciences12080297.

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Due to inherent variability arising from unpredictable geological depositional and post-depositional processes, the geotechnical parameters of Laflamme sea clay deposits remain highly uncertain. This study aims to develop and apply a methodology to assess the uncertainties of geotechnical parameters using statistical distributions for a landslide-prone Saguenay Lac-Saint-Jean (SLSJ) region. We used the measured physical and mechanical parameters of Laflamme Sea clays of various locations in the SLSJ region to characterize the geotechnical parameters in a representative manner. Goodness-of-fit tests assign each physical and mechanical parameter a distribution function for their descriptive analysis. We found that the quality of these tests is significantly influenced by outliers. The detected outliers in the dataset considerably impact the distribution type and the uncertainties of the specific geotechnical parameter. Subsequently, appropriate distribution functions for each parameter were assigned after treating the outliers. The derived coefficient of variability values for the SLSJ region were significantly high in comparison to the literature with cone penetration test data being only the exception. Finally, the results indicated that the uncertainties of geotechnical parameters of the Saguenay-Lac-Saint-Jean region marine clays are high as compared to Scandinavian clays and are relatively comparable to other eastern Canadian clays.
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Arshid, Muhammad Usman, e M. A. Kamal. "Regional Geotechnical Mapping Employing Kriging on Electronic Geodatabase". Applied Sciences 10, n. 21 (29 ottobre 2020): 7625. http://dx.doi.org/10.3390/app10217625.

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A regional geotechnical map was developed by employing kriging using spatial and s geostatistical analysis tools. Many studies have been carried out in the field of topography, digital elevation modeling, agriculture, geological, crop, and precipitation mapping. However, no significant contribution to the development of geotechnical mapping has been made. For the appraisal of a geotechnical map, extensive field explorations were carried out throughout the geotechnically diversified plateau spread over an area of approximately 23,000 km2. In total, 450 soil samples were collected from 75 data stations to determine requisite index properties and soil classification for the subsequent allowable bearing capacity evaluation. The formatted test results, along with associated geospatial information, were uploaded to ArcMap, which created an initial input electronic database. The kriging technique of geostatistical analysis was determined to be more feasible for generating a geotechnical map. The developed map represents the distribution of soil in the region as per the engineering classification system, allowable bearing capacity, and American Association of State Highway and Transportation Officials (AASHTO) subgrade rating for 1.5-, 3.0-, and 4.5-m depths. The accuracy of the maps generated using kriging interpolation technique under spatial analyst tools was verified by comparing the values in the generated surface with the actual values measured at randomly selected validation points. The database was primarily created for the appraisal of geotechnical maps and can also be used for preliminary geotechnical investigations, which saves the cost of soil investigations. In addition, this approach allows establishing useful correlations among the geotechnical properties of soil.
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Poenaru, Alexandru. "Validation of Correlations Between in Situ Investigations and Soil Parameters Using FEM Modeling". Modelling in Civil Environmental Engineering 18, n. 1 (1 marzo 2023): 25–37. https://doi.org/10.2478/mmce-2023-0003.

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Abstract This paper aims to validate the geotechnical parameters obtained using new proposed correlations [1] with in situ test results by using the finite element method (FEM). To achieve this objective was performed a numerical modelling of a deep excavation built in the Northern area of Bucharest, by using several constitutive models such as Mohr-Coulomb, Hardening Soil and HS-Small. The geotechnical parameters used as input data for the numerical model were determined based on in situ soil investigations and using new proposed correlations described in [1]. The numerical model results in terms of horizontal displacements of the diaphragm walls supporting the deep excavation were compared to the measured displacements obtained from 2 inclinometers. Based on these results useful conclusions regarding the validity of the proposed correlations are drawn. This paper is part of wider doctoral research regarding correlations between in situ tests and geotechnical parameters.
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Sa’ur, Ruba H., Duaa Al-Jeznawi, Saif Alzabeebee, Luís Filipe Almeida Bernardo e Suraparb Keawsawasvong. "Geotechnical and Geophysical Assessment of the Soil Layers of the Missan Combined-Cycle Power Plant Project". CivilEng 5, n. 3 (29 agosto 2024): 717–35. http://dx.doi.org/10.3390/civileng5030038.

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This study investigated the geotechnical and geophysical properties of the soil layers at the Missan combined-cycle power plant in Iraq. The data from 69 boreholes, including physical and chemical soil properties, were analyzed. The soil is primarily classified as silty clay with moderate to high plasticity, with some sandy layers. Since the Missan governorate is located in a seismically active region represented by the Iraq–Iran border, a study on the seismic properties of the site is also performed. Seismic downhole tests were conducted to determine wave velocities and dynamic moduli. The site was classified as soft clay soil according to FEMA and Eurocode 8 standards. Correlations for the physical and dynamic soil properties were evaluated. The correlations were executed via regression statistical analysis via Microsoft Excel software (2013). The results of the correlation equations and the coefficient of correlation R2 show that the physical correlations were considered medium to good correlations, whereas the dynamic soil correlations were perfectly correlated such that the R2 values were close to 1. This paper provides comprehensive data and soil property correlations, which can be valuable for future construction projects in the Missan area and similar geological formations.
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Abbas, Hasan Ali, Duaa Al-Jeznawi, Musab Aied Qissab Al-Janabi, Luís Filipe Almeida Bernardo e Manuel António Sobral Campos Jacinto. "Exploring Shear Wave Velocity—NSPT Correlations for Geotechnical Site Characterization: A Review". CivilEng 5, n. 1 (22 gennaio 2024): 119–35. http://dx.doi.org/10.3390/civileng5010006.

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Shear wave velocity (Vs) is a critical parameter in geophysical investigations, micro-zonation research, and site classification. In instances where conducting direct tests at specific locations is challenging due to equipment unavailability, limited space, or initial instrumentation costs, it becomes essential to estimate Vs directly, using empirical correlations for effective site characterization. The present review paper explores the correlations of Vs with the standard penetration test (SPT) for geotechnical site characterization. Vs, a critical parameter in geotechnical and seismic engineering, is integral to a wide range of projects, including foundation design and seismic hazard assessment. The current paper provides a detailed analysis of the key findings, implications for geotechnical engineering practice, and future research needs in this area. It emphasizes the importance of site-specific calibration, the impact of geological background, depth-dependent behavior, data quality control, and the integration of Vs data with other geophysical methods. The review underlines the continuous monitoring of Vs values due to potential changes over time. Addressing these insights and gaps in research contributes to the accuracy and safety of geotechnical projects, particularly in seismic-prone regions.
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Più fonti

Tesi sul tema "Geotechnical correlations"

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Hurley, Shawn J. "Development of a settling column and associated primary consolidation monitoring systems for use in the geotechnical centrifuge : investigation of geotechnical-geophysical correlations /". Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape8/PQDD_0009/MQ42397.pdf.

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Vardanega, Paul Joseph. "Strength mobilisation for geotechnical design & its application to bored piles". Thesis, University of Cambridge, 2012. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.610440.

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3

Berglin, Alexander. "Short-term deformations in clay under a formwork during the construction of a bridge : A design study". Thesis, KTH, Jord- och bergmekanik, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-212060.

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During the casting of a concrete bridge deck, the temporary formwork is causing the underlying ground to deform if a shallow foundation solution is used. There are often demands on the maximum deformation of the superstructure when designing the foundation for the formwork.  To keep the deformations within the desired limits, several ground improvement methods like deep mixing columns or deep foundation methods like piling can be used. Permanent ground improvement methods are however expensive, and far from always needed. To reduce the need for unnecessary ground improvements, it is crucial to calculate the predicted deformations accurately during the design phase. The purpose of this thesis was to investigate how short-term deformations in clay under a formwork during bridge construction should be calculated more generally in future projects. Three different calculation models have here been used to calculate the ground deformations caused by the temporary formwork. A simple analytical calculation and two numerical calculations based on the Mohr Coulomb and Hardening Soil-Small constitutive models. The three calculation models were chosen based on their complexity. The analytical calculation model was the most idealised and the Hardening Soil-Small to be the most complex and most realistic model. Results show that the numerical calculation model Mohr Coulomb and the analytical calculation model gives the best results compared to the measured deformation. One of the most probable reasons for the result is that both of the models require a few input parameters that can easily be determined by well-known methods, such as triaxial-, routine- and CRS-tests. The more advanced Hardening soil small model requires many parameters to fully describe the behaviour of soil. Many of the parameters are hard to determine or seldom measured. Due to the larger uncertainties in the parameter selection compared with the other two models, the calculated deformation also contains larger uncertainties.
Vid gjutning av betongbrodäck kommer den underliggande marken att deformeras av den temporära formställningen, som tar upp lasterna medan betongen härdar. Det finns oftast krav på hur stora markdeformationerna maximalt får vara. För att hålla deformationerna inom gränserna kan diverse markförstärkningsmetoder, så som kalkcementpelare eller pålar, användas. Permanenta markförstärkningar är oftast väldigt dyra och inte alltid nödvändiga. Ett alternativ till att använda dyra markförstärkningar skulle kunna vara att beräkna den förutspådda deformationen med stor exakthet i projekteringsstadiet. Syftet med det här arbetet var att undersöka hur korttidsstätningar i lera vid en bronybyggnation ska beräknas mer generellt i framtida projekt.  I detta arbete har tre beräkningsmodeller använts för att beräkna markdeformationerna från den temporära formställningen. En enklare analytisk modell samt två numeriska beräkningsmodeller som baseras på Mohr Coulomb och Hardening Soil Small teorierna. De tre beräkningsmodellerna valdes utifrån deras komplexitet. Den analytiska beräkningen ansågs vara den mest förenklade modellen medan Hardening Soil-Small var den mest komplexa och realistiska modellen.   Resultatet visar att trots sin enkelhet så ger den numeriska beräkningsmodellen Mohr Coulomb och den analytiska beräkningen bäst resultat jämfört med de uppmätta deformationerna. En möjlig anledning till det goda resultatet är att modellerna endast kräver ett fåtal ingångsparametrar som kan bestämmas med hjälp av välkända fält- och laboratoriemetoder så som triaxialförsök, rutinlaboratorieförsök och CRS-försök. Den mer komplexa modellen Hardening Soil Small kräver flera ingångsparametrar för att kunna modellera jordens beteende. Många av parametrarna är svåra att bestämma då mätdata oftast saknas. Osäkerheterna i valet av ingångsparametrar för den mer komplexa hardening soil small modellen är större än de två andra studerade modellerna, vilekt även ger upphov till större osäkerheter i dem beräknade deformationerna.
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Persson, Erik. "Empirical correlation between undrained shear strength and preconsolidation pressure in Swedish soft clays". Thesis, KTH, Jord- och bergmekanik, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-213848.

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Abstract (sommario):
The undrained shear strength and preconsolidation pressure are key parameters in describing the characteristics of soft clays. The two parameters both reflect the clay’s structure and state of stress, and hence empirical correlations for undrained shear strength normalized with respect to preconsolidation pressure are widely used to assess soil behavior. The empirical correlations given in the literature are typically dependent on liquid limit, or plasticity index, but some studies have questioned the dependency and proposed correlations constant for consistency limits. Data from geotechnical projects often display a considerable scatter and deviate from established empirical correlations. In this thesis, statistical analyses are performed and evaluated qualitatively on direct simple shear, constant rate of strain and fall cone test data from 146 sampling points with a total of 596 soil samples from Stockholm, Gothenburg and Uppsala. The aim is to investigate the correlation between shear strength and the preconsolidation pressure. The thesis evaluates the normalized shear strength’s dependency on liquid limit, how the data corresponds to Hansbo’s (1957) and Swedish Geotechnical Institute’s (2007) linear empirical correlations, and the correction factor applied to shear strength measured by the fall cone test. The results of the study show that the correction factor typically reduces the shear strength from fall cone tests too much with respect to shear strength from direct simple shear tests. The normalized shear strength’s dependency on liquid limit may be rejected for the fall cone test data. The results for direct simple shear test data however, indicates a correlation with liquid limit. The data scatter is considerable, especially for fall cone test data, and the relevance of describing the normalized shear strength from fall cone test with a linear empirical correlation to liquid limit may conclusively be questioned.
Skjuvhållfasthet och förkonsolideringstryck är två viktiga jordparametrar för lösa leror. Båda parametrar reflekterar lerans struktur och spänningstillstånd, och empiriska korrelationer för odränerad skjuvhållfasthet, normaliserad mot förkonsolideringstrycket, används därför ofta för att bedöma en leras egenskaper. De empiriska korrelationerna är vanligen kopplade till flytgräns eller plasticitetsindex. Dessa korrelationer har däremot ifrågasatts av studier som i vissa fall istället föreslagit ett konstant förhållande mellan normaliserad odränerad skjuvhållfasthet och plasticitetsgränser. Mätvärden från geotekniska projekt i Sverige visar allmänt stor spridning avseende dessa parametrar och data avviker ofta från etablerade empiriska korrelationer. I examensarbetet har data från direkta skjuvförsök, ödometerförsök och fallkonförsök utvärderats statistiskt och kvalitativt. Totalt omfattar studien 596 jordprover från 146 provtagningspunkter från Stockholm, Göteborg och Uppsala. Syftet med studien är att undersöka korrelationen mellan odränerad skjuvhållfasthet och förkonsolideringstryck. Studien behandlar den normaliserade skjuvhållfashetens flytgränsberoende, Hansbos (1957) och Statens Geotekniska Instituts (2007) empiriska korrelationer, samt den korrektionsfaktor som ska tillämpas på skjuvhållfastheter från fallkonförsök. Resultatet visar att korrektionsfaktorn reducerar skjuvhållfastheten för mycket och att korrigerade skjuvhållfastheter är i sämre samstämmighet med skjuvhållfastheter från direkta skjuvförsök än okorrigerade. Data från fallkonförsök uppvisar inget tydligt flytgränsberoende, medan resultaten från direkta skjuvförsök indikerar ett beroende. Spridningen i data är dock påfallande, särskilt för fallkonförsöket. Relevansen i att tillämpa en linjär empirisk korrelation för odränerad normaliserad från fallkonförsök mot förkonsolideringstryck beroende av flytgräns bör ifrågasättas.
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5

Bou-Mekhayel, Myriam. "Geotechnical and Geothermal Properties of Louisiana Coastal Sediments". ScholarWorks@UNO, 2019. https://scholarworks.uno.edu/td/2589.

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Land loss in South Louisiana is increasing at a fairly rapid rate. In an effort to reduce land loss and save the marshes of Louisiana, marsh creation projects have been proposed in carefully selected regions around the coast as part of the CPRA Coastal Master Plan 2017. Properties and characteristics of the soil obtained from soil borings were analyzed and used to determine the various design parameters that allow the marsh creation process to occur. Other properties that were taken into consideration for Louisiana coastal sediment are the geothermal properties. This research analyses those different properties obtained from geotechnical reports from CPRA and other data bases, in order to find correlations between the different soil characteristics, specifically between the soil’s compressive strength, consolidation properties, Atterberg Limits and moisture content. Furthermore, this research also studies the geothermal properties of selected Louisiana soils and the correlation between moisture content and thermal conductivity.
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Kiflu, Henok Gidey. "Optimized Correlation of Geophysical And Geotechnical Methods In Sinkhole Investigations: Emphasizing On Spatial Variations In West-Central Florida". Scholar Commons, 2013. http://scholarcommons.usf.edu/etd/4709.

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Abstract Sinkholes and sinkhole-related features in West-Central Florida (WCF) are commonly identified using geotechnical investigations such as standard penetration test (SPT) borings and geophysical methods such as ground penetrating radar (GPR) and electrical resistivity tomography (ERT). Geophysical investigation results can be used to locate drilling and field testing sites while geotechnical investigation can be used to ground truth geophysical results. Both methods can yield complementary information. Geotechnical investigations give important information about the type of soil, groundwater level and presence of low-density soils or voids at the test location, while geophysical investigations like GPR surveys have better spatial coverage and can resolve shallow stratigraphic indicators of subsidence. In GPR profiles collected at 103 residential sites in covered-karst terrain in WCF, sinkhole-related anomalies are identified using GPR and SPT methods. We analyze the degree to which the shallow features imaged in GPR correlate spatially with the N-values (blow counts) derived from SPTs at the 103 residential sites. GPR anomalies indicating sinkhole activity are defined as zones where subsurface layers show local downwarping, discontinuities, or sudden increases in amplitude or penetration of the GPR signal. "Low SPT values" indicating sinkhole activity are defined using an optimization code that searched for threshold SPT value showing optimum correlation between GPR and SPT for different optimal depth ranges. We also compared these criteria with other commonly used geotechnical criteria such as weight of rod and weight of hammer conditions. Geotechnical results were also used to filter the data based on site characteristics such as presence of shallow clay layers to study the effectiveness of GPR at different zones. Subsets of the dataset are further analyzed based on geotechnical results such as clay thickness, bedrock depth, groundwater conditions and other geological factors such as geomorphology, lithology, engineering soil type, soil thickness and prevalent sinkhole type. Results are used to examine (1) which SPT indicators show the strongest correlations with GPR anomalies, (2) the degree to which GPR surveys improve the placement of SPT borings, and (3) what these results indicate about the structure of sinkholes at these sites. For the entire data set, we find a statistically significant correlation between GPR anomalies and low SPT N-values with a confidence level of 90%. Logistic regression analysis shows that the strongest correlations are between GPR anomalies and SPT values measured in the depth range of 0-4.5 m. The probability of observing a GPR anomaly on a site will decrease by up to 84% as the minimum SPT value increases from 0 to 20 in the general study area. Boreholes drilled on GPR anomalies are statistically significantly more likely to show zones of anomalously low SPT values than boreholes drilled off GPR anomalies. We also find that the optimum SPT criteria result in better correlation with GPR than other simple commonly used geotechnical criteria such as weight of rod and weight of hammer. Better correlations were found when sites with poor GPR penetrations are filtered out from the dataset. The odds ratio showed similar result while the result varied with the depth range, statistics and threshold SPT value (low N- value with optimum correlation), with a maximum observed odds ratio of 3. Several statistical results suggest that raveling zones that connect voids to the surface may be inclined, so that shallow GPR anomalies are laterally offset from deeper zones of low N-values. Compared to the general study area, we found locally stronger correlation in some sub-regions. For example, the odds ratio found for tertiary hawthorn subgroup were 25 times higher than the odds ratio found for the general study area (WCF).
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7

Burzawa, Audrey. "Diagnostic multi-échelle de la plateforme ferroviaire par ondes mécaniques guidées". Electronic Thesis or Diss., Sorbonne université, 2024. http://www.theses.fr/2024SORUS483.

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La caractérisation de l'état mécanique des plateformes ferroviaires (PF) est essentielle pour garantir la sécurité et la pérennité du réseau ferré. Les méthodes d'investigation géotechniques, couramment utilisées, permettent d'accéder aux paramètres mécaniques mais ne fournissent qu'un aperçu épars de l'état du milieu investigué et restent donc limitées par leur nature ponctuelle et leur faible rendement. En parallèle, les méthodes géophysiques capables d'apprécier la qualité mécanique des couches de la PF sont actuellement peu adaptées au contexte ferroviaire. Les récents développements et applications de la méthode sismique par ondes de surface dans les problématiques géotechniques et ferroviaires en font une technique d'investigation non destructive prometteuse. Une preuve de concept démontrant la faisabilité et la reproductibilité de la méthode sismique par ondes de surface pour la caractérisation des PF a donc été réalisée sur un site pilote. Cette méthode a montré qu'elle était capable de détecter des variations des propriétés mécaniques en lien avec des désordres de la plateforme. La formulation bayésienne de l'inversion a permis d'évaluer et de quantifier les incertitudes sur les résultats obtenus, offrant ainsi un outil d'aide à la décision. Les étapes d'acquisition et de traitement ont été abordées afin de proposer des outils à plus haut rendement et adaptés aux contraintes d'exploitation ferroviaire. Des techniques de mise en œuvre plus rapides, ne nécessitant pas l'étape fastidieuse d'implantation des géophones dans le sol, ont été évaluées. La comparaison d'un dispositif tracté de type landstreamer avec un dispositif classique a permis de valider son utilisation, tant sur les pistes que sur les voies. Afin d'automatiser la tâche de traitement des ondes de surface, consistant à pointer la dispersion, un outil basé sur de la segmentation d'images a été développé. La base de données utilisée pour l'apprentissage a été créée à partir de modèles de sol caractéristique des PF. Le modèle basé sur l'architecture U-Net, permet une identification précise des maxima d'énergie et une attribution des modes de propagation. Enfin, dans le but d'améliorer la complémentarité entre méthodes géophysiques et géotechniques lors de la construction des a priori et des interprétations, des tests de corrélation entre la vitesse de cisaillement et la résistance à la pénétration ont été menés. L'évaluation des lois de passage issues de la bibliographie a ainsi permis de faire le lien entre la méthode sismique par ondes de surface et les outils conventionnels de caractérisation des PF
Characterizing the mechanical properties of railway trackbeds (RT) is essential to ensure the safety and durability of the rail network. Currently, the geotechnical investigation methods used provide access to the mechanical parameters of the RT and the shallow railway earthwork (RE), but they only offer a scattered overview of the state of the medium being investigated, and are therefore limited by their ad hoc nature and low efficiency. Geophysical methods capable of conducting a mechanical diagnosis of the RT are, as of now, poorly adapted to the railway context. However, recent developments and applications of the seismic surface-wave method to geotechnical problems and the railway context make it a promising non-destructive investigation technique. A proof of concept was thus conducted at a pilot site, demonstrating the feasibility and reproducibility of the surface-wave method for characterizing RE. The method proved capable of detecting variations in mechanical properties associated with RT issues. The Bayesian formulation of the inversion allowed for the assessment and quantification of uncertainties in the proposed results, thereby offering a valuable decision-making tool. The acquisition and processing stages were addressed in order to propose more efficient tools. Faster implementation techniques that reduce the time-consuming step of installing geophones in the ground were evaluated. The comparison of a towed setup, such as a landstreamer, with a conventional setup was used to validate its application in a railway context, both on the cess and the track. A tool based on artificial intelligence algorithms, specifically image segmentation algorithms, was developed to automate the task of surface-wave dispersion picking. The database used for training was created from wavefield modeling in a soil model characteristic of RT. The developed U-Net architecture enables precise identification of energy maxima and assignment of propagation modes. Lastly, to enhance the complementarity between geophysical and geotechnical methods when constructing and interpreting a priori, correlation tests between shear-wave velocity and cone resistance were conducted. The evaluation of laws from the literature facilitated the link between the seismic surface-wave method and conventional RE characterization tools
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Emanuelsson, Patrik. "Study of a new method to measure the stresses in rock by image technology : Use of sawn slots and DIgital Image Correlation". Thesis, Luleå tekniska universitet, Geoteknologi, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-68646.

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In rock constructions and mining it is important to know the current stress situation in the rock due to safety and construction reasons. Two of the widely used stress measurement methods are overcoring and hydraulic fracturing. Both methods are expensive, need new boreholes, and are complex and time consuming. The methods are also limited by the number of successfully achieved measurements series. An alternative method is therefore investigated by locally relieving stresses around the borehole wall using sawn slots. To determine the stresses in the rock, strain measurements will be done using optics and image processing of images taken before and after cutting of the slots. The images will be processed by a technique called Digital Image Correlation (DIC), a method where the pixels are fitted between the images by the greyscale. The thesis is roughly divided into three parts. The first part explains the basics of rock stresses and current stress measurement methods. The second part is a literature study of the theory behind optics and DIC. There is also a study about if it is possible to use optics from a smartphone and how it differs from a reference commonly used camera in DIC application. Last part consists of numerical calculations in 2D to investigate if there is a possibility to relieve the stress around the borehole walls by cutting slots. With the optics from a smartphone the borehole wall can be in focus on just a few millimeters distance. DIC is a well-developed method which has a good precision when being conducted right and with a good image quality. The combination of using a smartphone and DIC is, however, not fully investigated yet. Only one comparable study was found. It used a Sony tablet and measured the deformations instead of strains. However, that study showed that the measurement error was around 1% compared to the reference camera. When translating deformations into strains, it is most likely that the error will increase, because the error will also be affected from the difference in deformation before and after cutting the slots. The numerical part showed that it’s possible to relieve the stress at parts of the borehole walls for the investigated conditions. To fully relieve the stresses around the borehole wall, it is necessary to have two slots with a short c-c distance and relatively deep slots. In this case a c-c distance of 15 mm and slot depth of at least 25 mm are recommended.
Vid projekt inom berganläggningar och gruvor är det viktigt att känna till de rådande spänningar i berget i ett säkerhets- och konstruktionsperspektiv. I Sverige används framförallt två undersökningsmetoder - överborrning eller hydraulisk spräckning. Två metoder som dock är dyra och relativt få mätserier kan genomföras. En alternativ metod har därför undersökts där borrhålsväggen lokalt avlastas genom sågade slitsar. Töjningsmätning sker genom att fotografera borrhålsväggen innan och efter sågning av slitsarna. Därefter sker bildbehandling via Digital Image Correlation (DIC). En metod som jämför en pixels placerings förändring genom att matcha pixeln via gråskalan. Examensarbetet kan man säga är grovt indelat i tre delar. Den första delen innefattar teorin som handlar om bergspänningar samt nuvarande mätmetoder för att mäta bergsspänningar. Andra delen är en litteraturstudie som behandlar den bakomliggande teorin för optik och bildbehandling med DIC samt en kort undersökning om det är möjligt att använda den optiska tekniken som finns i en smartphone. Sista delen utgörs av numeriska modelleringar i 2D för att verifiera om det går att fullständigt avlasta ett borrhål genom sågade slitsar. Med optik som finns i en smartphone kan bergväggen vara i fokus på bara ett par millimeters avstånd. DIC i sig är en teknik som är så pass utvecklad att precisionen i mätningarna är väldigt god. Förutsatt att bildbehandling görs korrekt och bildkvalitén är god. Kombinationen med optik liknande den från smartphone och bildbehandling med DIC är dock inte fullständigt undersökt. Enbart en jämförbar studie har hittats där deformationsmätningar har gjort med hjälp av en Surfplatta från Sony. Denna undersökning visade att mätfelet mot en referenskamera är cirka 1%. Dock förstärks mätfelet vid töjningsmätningar. Förstärkningen beror dock även av deformationsskillnaden mellan innan och efter avlastning. Den numeriska delen har visat att det går att lokalt avlasta bergväggen fullständigt för det undersökta spänningsförhållandet. Dock krävs det att två slitsar sitter på ett litet c-c avstånd samt är relativt djupa. Två undersökta slitsuppsättningar har visat på fullständigt avlastning, samt ytterligare ett fall som skulle kunna vara användbart.
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Yaman, Gokhan. "Prediction Of Geotechnical Properties Of Cohesive Soils From In-situ Tests: An Evaluation Of A Local Database". Master's thesis, METU, 2007. http://etd.lib.metu.edu.tr/upload/2/12608120/index.pdf.

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In any geotechnical design procedure, the fundemantal point to be initially clearified is the characterization of existing soil profile at a site. This requires a great deal of planning a suitable site investigation program including borings, sampling, laboratory and in situ testing etc. Laboratory and in-situ (field) tests are important tools leading to the estimation of soils properties in geotechnics. Beside laboratory tests, the measurement of engineering properties in situ is a continuously growing and developing trend, particularly in materials difficult to obtain perfect undisturbed samples. For the purpose of this study, two large volumed geotechnical investigation reports are collected from a wide archive of 30 years experiences. Different soil types are encountered during the study like alluvial deposits of soft to stiff cohesive materials, hard clays in appearance of highly weathered rocks. The in-situ tests mostly being focused and studied on are &ldquo
Pressuremeter Test&rdquo
and &ldquo
Standard Penetration Test&rdquo
on cohesive materails. Over 350 standard penetration test results are recorded together with the pressuremeter results of relevant soils. Besides, the corresponding laboratory test results of oedometer, triaxial loading and all index properties of soils are assembled. The results of in-situ tests are evaluated together with the results of laboratory tests performed on the samples obtained from related sites. The correlations between in-situ &
laboratory test results on shear strength, compressibility and deformation characteristics of soils are analysed and compared with the existing correlations in literature. The correlations are generally obtained to be in agreement with the ones in common literature in cases where the soil conditions, particularly saturation, are same in both laboratory and in-situ tests.
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Bolinder, Adam. "CPT-sondering och trycksondering, en jämförande studie om utvärdering av friktionsvinkel i friktionsjord". Thesis, Uppsala universitet, Institutionen för geovetenskaper, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-324802.

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Knowledge of the soils friction angle is necessary to avoid landslides at slope stability surveys and dimensioning for foundation of different constructions. Frictional forces mainly builds up friction soil and the friction angle is defined by the angle when landslides occur. Friction angle can be evaluated using CPT or pressure probe. Both methods are performed similarly, with constant pressure and sink rate, but differ in time, cost, competence requirements and number of measurable parameters. The methods also differ when evaluating the friction angle. For CPT, the Conrad software is used while pressure probe is evaluated with empirical values, set against the peak pressure. This degree project compares the results from performed and evaluated CPT and pressure probes from several drill points in a project. The purpose of the study is to draw conclusions about the soils friction angle, whether the empirically evaluated values of the friction angle by pressure probing, can be correlated with the values of the friction angle through CPT, evaluated with the Conrad software. Both CPT and the evaluation with Conrad are more advanced methods and are therefore seen as the correct value for the soils friction angle. The result shows that pressure probe provides a good indication when evaluating the friction angle and can be used, with the knowledge that the friction angle is rarely evaluated higher than from CPT. The methods differ the most towards the surface to almost correlate towards the depth.
Kunskap om jordens friktionsvinkel är nödvändig vid bland annat släntstabilitetsutredning samt dimensionering för grundläggning av byggnader och anläggning. Friktionsjord byggs huvudsakligen upp av friktionskrafter och friktionsvinkeln definieras av vinkeln då ras uppstår. Friktionsvinkeln kan bland annat utvärderas med hjälp av resultat från CPT eller trycksondering. Båda metoderna utförs på liknande sätt, med konstant tryck och sjunkningshastighet men skiljer sig i tidsåtgång, kostnad, kompetenskrav samt antal mätbara parametrar. Metoderna skiljer sig också vid utvärdering av friktionsvinkel. För CPT används programvaran Conrad medan trycksondering utvärderas med empiriskt framtagna värden, ställda mot spetstrycket. Detta examensarbete jämför resultaten från utförda och utvärderade CPT resp. trycksonderingar från ett flertal borrpunkter i ett projekt. Syftet med studien är att dra slutsatser om jordens friktionsvinkel, huruvida de empiskt utvärderade värden för friktionsvinkeln genom trycksondering kan korreleras med värden för friktionsvinkeln genom CPT, utvärderande med programvaran Conrad. Både CPT-sondering och utvärdering med Conrad är avancerade metoder och ses därför som det mer korrekta värdet för jordens friktionsvinkel. Resultatet visar att trycksondering ger en bra indikation vid utvärdering av friktionsvinkel och kan användas, med vetskapen att friktionsvinkeln sällan utvärderas högre än från CPT. Skillnaden vid utvärdering är som störst nära markytan och minskar för att nära på korrelera mot djupet.
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Libri sul tema "Geotechnical correlations"

1

Verbrugge, Jean-Claude, e Christian Schroeder. Geotechnical Correlations for Soils and Rocks. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2018. http://dx.doi.org/10.1002/9781119482819.

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2

Ameratunga, Jay, Nagaratnam Sivakugan e Braja M. Das. Correlations of Soil and Rock Properties in Geotechnical Engineering. New Delhi: Springer India, 2016. http://dx.doi.org/10.1007/978-81-322-2629-1.

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3

Schroeder, Christian, e Jean-Claude Verbrugge. Geotechnical Correlations for Soils and Rocks. Wiley & Sons, Incorporated, John, 2018.

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Schroeder, Christian, e Jean-Claude Verbrugge. Geotechnical Correlations for Soils and Rocks. Wiley & Sons, Incorporated, John, 2018.

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5

Schroeder, Christian, e Jean-Claude Verbrugge. Geotechnical Correlations for Soils and Rocks. Wiley & Sons, Incorporated, John, 2018.

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6

Schroeder, Christian, e Jean-Claude Verbrugge. Geotechnical Correlations for Soils and Rocks. Wiley-ISTE, 2018.

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7

Das, Braja M., Nagaratnam Sivakugan e Jay Ameratunga. Correlations of Soil and Rock Properties in Geotechnical Engineering. Springer, 2019.

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8

Correlations of soil and rock properties in geotechnical engineering. Springer, 2016.

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9

Das, Braja M., Nagaratnam Sivakugan e Jay Ameratunga. Correlations of Soil and Rock Properties in Geotechnical Engineering. Springer London, Limited, 2016.

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10

Correlation of CPT and Field Vane Tests for Clay Tills: DGF-Bulletin 7 (Danish Geotechnical Society). Ramboll & Hannemann, 1991.

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Capitoli di libri sul tema "Geotechnical correlations"

1

Ameratunga, Jay, Nagaratnam Sivakugan e Braja M. Das. "Correlations for Laboratory Test Parameters". In Developments in Geotechnical Engineering, 51–86. New Delhi: Springer India, 2015. http://dx.doi.org/10.1007/978-81-322-2629-1_3.

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Lade, P. V. "Engineering Properties of Soils and Typical Correlations". In Geotechnical and Geoenvironmental Engineering Handbook, 43–67. Boston, MA: Springer US, 2001. http://dx.doi.org/10.1007/978-1-4615-1729-0_3.

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Cruz, N., J. Cruz, C. Rodrigues, L. Fagundes e C. Chaquisse. "Correlations between SPT and DPSH results based in energy measurements". In Geotechnical Engineering Challenges to Meet Current and Emerging Needs of Society, 414–17. London: CRC Press, 2024. http://dx.doi.org/10.1201/9781003431749-53.

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4

Zou, Haifeng, Songyu Liu, Guojun Cai e Anand J. Puppala. "Multivariate Correlations Among SCPTU Parameters of Jiangsu Cohesionless Soils". In Proceedings of GeoShanghai 2018 International Conference: Multi-physics Processes in Soil Mechanics and Advances in Geotechnical Testing, 364–72. Singapore: Springer Singapore, 2018. http://dx.doi.org/10.1007/978-981-13-0095-0_41.

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Nambiar, Deepa Kunhiraman, Tadahiro Kishida, Tareq Fahmy Abdallatif e Mohammad H. AlHamaydeh. "VS30 Correlations from Shear Wave Velocity Profiles in the UAE". In Proceedings of the 4th International Conference on Performance Based Design in Earthquake Geotechnical Engineering (Beijing 2022), 971–79. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-031-11898-2_74.

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Al-Azazmeh, A., e A. Mahler. "Development of CPT-Vs correlations for soft quaternary clays of Szeged city Hungary". In Geotechnical Engineering Challenges to Meet Current and Emerging Needs of Society, 282–85. London: CRC Press, 2024. http://dx.doi.org/10.1201/9781003431749-25.

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Lloret-Cabot, M., K. Zhang, W. Zhang e D. Toll. "Relevance of correlation length in geotechnical engineering". In Geotechnical Engineering Challenges to Meet Current and Emerging Needs of Society, 1760–63. London: CRC Press, 2024. http://dx.doi.org/10.1201/9781003431749-328.

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Das, Sukanta. "Application of Digital Image Correlation Technique in Geotechnical Engineering". In Lecture Notes in Civil Engineering, 143–51. Singapore: Springer Nature Singapore, 2024. http://dx.doi.org/10.1007/978-981-99-9610-0_13.

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Arbanas, Željko, Josip Peranić, Vedran Jagodnik, Martina Vivoda Prodan e Nina Čeh. "Remedial Measures Impact on Slope Stability and Landslide Occurrence in Small-Scale Slope Physical Model in 1 g Conditions". In Progress in Landslide Research and Technology, 197–220. Cham: Springer Nature Switzerland, 2023. http://dx.doi.org/10.1007/978-3-031-44296-4_9.

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AbstractPhysical modelling of landslides by analysing the behaviour of small-scale landslide models subjected to artificial rainfall can be divided into modelling under 1 g conditions and under increased acceleration (n times gravity) in a centrifuge. Physical modelling of landslide initiation began in 1970s in Japan on scaled natural slope models and after initial experiences with field and laboratory research, the small-scale landslide modelling has found a wide application around the world in different aspects of landslide investigations, analysing different types of landslides, different types of slope materials and landslide movements. The main task of landslide physical modelling is research of initiation, motion and accumulation of fast flow-like slides caused by infiltration of surface water or by shaking on a shaking table. Studies that have included landslide mitigation measures into small-scale physical models are rare and have not established correlations with a behaviour of on-site mitigation constructions. This paper discusses the behaviour of small-scale slope models supported by remedial measures under artificial rain in 1 g loading conditions. Models of slope built of different materials, with and without applied remedial measures (gravity retaining wall, gabion wall, pile wall) were exposed to identical intensities of artificial rainfall. The results of the simulations indicated that the slopes supported by remedial measures retained stability of the slope in the same conditions in which the sandy slope collapsed, as well as under significantly prolonged precipitations. At the end of the simulations, significantly higher rainfall intensities were applied to the supported slopes, exceeding the infiltration capacity of the slope material and affecting surface runout. The combination of surface erosion and saturation of superficial layer of a slope caused initiations of flow processes, while complete saturation of a slope when ground water level reached slope surface caused forming of a surface of rupture and consequently movements of the formed landslide body. The data obtained from the geodetic and geotechnical monitoring system enabled understanding of the overall process of rainfall infiltration and soil strength reduction to the development of the surface of rupture in a slope.
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Naseem, Ahsan, Fazal-e. Jalal, Hans De Backer, Ken Schotte e Muhammad Kashif. "Correlation of Electrical Resistivity Test with the Geotechnical Parameters of Sandy Soil". In Recent Advances in Geo-Environmental Engineering, Geomechanics and Geotechnics, and Geohazards, 191–93. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-030-01665-4_45.

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Atti di convegni sul tema "Geotechnical correlations"

1

Ramsey, N. "Validating Geotechnical Correlations - Why and How". In 1st EAGE/SUT Workshop on Integrated Site Characterization for Offshore Wind in Asia Pacific, 1–3. European Association of Geoscientists & Engineers, 2024. http://dx.doi.org/10.3997/2214-4609.202476018.

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Lafuerza, S., M. Canals e M. Galavazi. "Correlations Between Well Logs and Geotechnical Properties". In Offshore Technology Conference. Offshore Technology Conference, 2006. http://dx.doi.org/10.4043/18064-ms.

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Tho, Kee Kiat, e Nancy Chan. "Practical Application of Machine Learning to Geotechnical Correlations". In Offshore Technology Conference Asia. Offshore Technology Conference, 2020. http://dx.doi.org/10.4043/30218-ms.

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Howard, Isaac L., e W. Griffin Sullivan. "Stabilizing Very High Moisture Content Fine Grained Soils: Early Age Strength and Later Age Property Correlations". In Geotechnical Frontiers 2017. Reston, VA: American Society of Civil Engineers, 2017. http://dx.doi.org/10.1061/9780784480472.094.

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Bryson, L. S., I. C. Gomez-Gutierrez e T. C. Hopkins. "Correlations between Durability and Geotechnical Properties of Compacted Shales". In Geo-Frontiers Congress 2011. Reston, VA: American Society of Civil Engineers, 2011. http://dx.doi.org/10.1061/41165(397)420.

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Godlewski, Tomasz, e Małgorzata Wszędyrówny-Nast. "Correlations of Regional Geotechnical Parameters on the Basis of CPTU and DMT Tests". In The 13th Baltic Sea Region Geotechnical Conference. Vilnius Gediminas Technical University, 2016. http://dx.doi.org/10.3846/13bsgc.2016.002.

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The requirements for field research for Polish conditions demand proper dependences. Dependences based on more than 30 localizations for different genetic types of soils were derived for the area of Poland. Direct results from CPT, DMT and profiles from boreholes have been collected at the test sites for individual localization. For interpretation of results, dependences and diagrams of CPTU versus DMT were created. Correlations on the background of results from literature for different types of soils for numerous research areas were collected, with established dependences for Polish grounds conditions. Additionally some recommendations for the interpretation of the results from CPTU and DMT tests for analysed soils have been proposed.
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Gomez-Gutierrez, I. C., L. S. Bryson e T. C. Hopkins. "Correlations between Geotechnical Properties and the Swell Behavior of Compacted Shales". In Geo-Frontiers Congress 2011. Reston, VA: American Society of Civil Engineers, 2011. http://dx.doi.org/10.1061/41165(397)421.

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Gamez, J., e S. Olson. "Cone Penetration Test-Based Correlations to Forecast Critical State Parameters". In 7th International Conference on Geotechnical and Geophysical Site Characterization. CIMNE, 2024. http://dx.doi.org/10.23967/isc.2024.032.

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Jacquard*, C., T. Besson, M. Rispal, P. Reiffsteck e F. Szymkiewicz. "Correlations Between The Pressuremeter And The Rigid Dilatometer Parameters In Soils". In 7th International Conference on Geotechnical and Geophysical Site Characterization. CIMNE, 2024. http://dx.doi.org/10.23967/isc.2024.090.

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Crawford, Matthew M., e Lindsey S. Bryson. "GEOPHYSICAL AND GEOTECHNICAL FIELD CORRELATIONS OF THE DOE RUN LANDSLIDE, NORTHERN KENTUCKY". In GSA Annual Meeting in Denver, Colorado, USA - 2016. Geological Society of America, 2016. http://dx.doi.org/10.1130/abs/2016am-281392.

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Rapporti di organizzazioni sul tema "Geotechnical correlations"

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Raja, Rameez Ali, Vidushi Toshniwal e Rodrigo Salgado. GIS-Based Geotechnical Database for Collaborative GIS. Purdue University, 2023. http://dx.doi.org/10.5703/1288284317637.

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INDOT spends at least 8 million dollars annually on geotechnical site investigations, not including the amounts spent by contractors. The laborious and costly job of data collection in geotechnical practice requires the efficient storing and organizing of this valuable data to develop correlations and trends in spatially varying geotechnical data. INDOT currently uses gINT software for managing geotechnical data and ArcGIS for storing boring logs and geotechnical reports. The INDOT geotechnical office is pursuing means to improve the efficiency of their operations by developing a GIS-based geotechnical database for secure storage, easy retrieval, and flexible sharing of geotechnical data to enhance decision making. SPR-4616 is the first step towards the development of a geotechnical data management system in which important decisions on the components and structure of the database were made. The report presents a detailed conceptual layout for the development of a geotechnical database following an object-oriented programming approach. The report discusses in detail the geotechnical applications, the field, laboratory, and verification tests that will be included in the database. The geotechnical variables required to perform the engineering analysis in designing specific applications are logically linked with the geotechnical tests from which they are obtained. Lastly, a detailed layout of the proposed database structure and a user workflow example is provided in the report and can serve as a guide during the development of the database system.
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Tandon, Samarth, Pablo Cazenave e Ming Gao. PR-328-103602-R01 Improved Site-Selection Modeling by Correlating ILI with Operational-Geotechnical Data. Chantilly, Virginia: Pipeline Research Council International, Inc. (PRCI), settembre 2017. http://dx.doi.org/10.55274/r0010854.

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The primary objective of the research is to establish better correlations between SCC severity and operational and geotechnical characteristics, and to develop improved models for site-selection for SCCDA excavations, hydrostatic testing or in-line inspection (ILI). This report summarizes the modeling efforts and results, gaps and direction for future studies.
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3

Macedo, Jorge, Paul Mayne, Sheng Dai, Paola Torres, Cody Arnold, Luis Vergaray e Yumeng Zhao. Cone Penetration Testing for Illinois Subsurface Characterization and Geotechnical Design. Illinois Center for Transportation, maggio 2024. http://dx.doi.org/10.36501/0197-9191/24-013.

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This project sets the stage for implementing a cone penetration testing (CPT) practice in the state of Illinois, providing recommendations for using and interpreting CPT soundings in subsurface investigations. This study also contributes to modernizing Illinois Department of Transportation (IDOT) policy to current CPT-related practices adopted in other departments of transportation, which is consistent with recommendations from the Federal Highway Administration. Toward the goals of this project, CPT soundings across the nine districts of the state of Illinois have been conducted, and available CPT data at IDOT have been evaluated. The generated data have been uniformly processed, generating a database of 156 CPTs distributed across the nine districts. The database also includes shear wave velocity profiles at 28 locations and pore pressure dissipation tests at 45 locations. In addition, information (editable and non-editable) provided by IDOT has been carefully examined. The provided information consisted of boreholes with standard penetration test (SPT) data and laboratory tests on collected Shelby tubes. This information has been used to develop SPT-CPT correlations that can be applied in the state of Illinois and to provide examples of interpreting seismic piezocone test (SCPTu) data in the context of laboratory testing. Due to the several independent, fast, and reliable measurements that can be conducted in a CPT sounding and the fact that they can be done cost-effectively, CPT soundings are increasingly being preferred for in situ testing, and their adoption at IDOT is a positive step forward and consistent with the best practices at other U.S. departments of transportation.
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Musty, Michael, Vuong Truong, Jay Clausen, Susan Frankenstein, Christopher Williams, Andrew Trautz, Stacy Howington e Raju Kala. Thermal infra-red comparison study of buried objects between humid and desert test beds. Engineer Research and Development Center (U.S.), agosto 2022. http://dx.doi.org/10.21079/11681/45064.

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This study pertains to the thermal variations caused by buried objects and their ramifications on soil phenomenology. A multitude of environmental conditions were investigated to observe the effect on thermal infrared sensor performance and detection capabilities. Correlations between these external variables and sensor contrast metrics enable determinable key factors responsible for sensor degradation. This document consists of two parts. The first part is a summary of data collected by the U.S. Army Corps of Engineers, Engineer and Research and Development Center Cold Regions Research and Engineering Laboratory (ERDC-CRREL), ERDC-Geotechnical Structures Laboratory, and Desert Research Institute at the Yuma Proving Ground (YPG) site in February 2020 and observations from this activity. The second part is a comparison of target visibility between data collected at YPG and data collected at the ERDC-CRREL test site in 2018.
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Lopez Ruiz, Maria Camila, Micaela Largent, Tracy Becker e Jennie Watson-Lamprey. Correlation of Ground Motion Duration with Spectral Acceleration and Implications for Expected Bridge Performance. Pacific Earthquake Engineering Research Center, University of California, Berkeley, CA, ottobre 2024. http://dx.doi.org/10.55461/pjpa6337.

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Construction or detailed evaluation of transportation infrastructure requires site-specific ground motions for input into nonlinear structural models. These site-specific ground motions are generally selected based on the magnitude, distance, and site condition of the recorded ground motion. A preliminary study performed by Slate Geotechnical Consultants found that duration and spectral acceleration are negatively correlated for large-magnitude earthquakes recorded on soft-soil sites (Vs30<360 m/s). This means that if the target spectral acceleration is above average, then the average duration associated with that ground motion should be below average for the scenario magnitude and distance. This ground motion duration correlation implies that the current state of the practice is overestimating the probability of collapse for structures. This project aims to improve the characterization of ground motion duration and evaluate how the improved characterization affects bridge fragilities used in the Performance-Based Earthquake Engineering (PBEE) framework. Numerical models for two prototype structures, a major toll bridge and a typical highway overpass, are developed using OpenSees. Using these models, the effect of ground motion duration is evaluated quantitatively following the PEER PBEE methodology.
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Ningthoujam, J., J. K. Clark, T. R. Carter e H. A. J. Russell. Investigating borehole-density, sonic, and neutron logs for mapping regional porosity variation in the Silurian Lockport Group and Salina Group A-1 Carbonate Unit, Ontario. Natural Resources Canada/CMSS/Information Management, 2024. http://dx.doi.org/10.4095/332336.

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Abstract (sommario):
The Oil, Gas and Salt Resources Library (OGSRL) is a repository for data from wells licenced under the Oil, Gas and Salt Resources Act for Ontario. It has approximately 50,000 porosity and permeability drill core analyses on bedrock cores. It also has in analogue format, geophysical logs (e.g., gamma ray, gamma-gamma density, neutron, sonic) from approximately 20,000 wells. A significant challenge for geotechnical and hydrogeological studies of the region is the accessibility of digital data on porosity and permeability. Recent work completed on approximately 12,000 core analyses for the Silurian Lockport Group and Salina Group A-1 Carbonate Unit are geographically concentrated within productive oil and gas pools. An opportunity therefore exists to expand the bedrock porosity characterization for southern Ontario by using geophysical logs collected in open-hole bedrock wells that are more geographically dispersed. As part of this study, hard copy files of analog geophysical logs are converted to digital data (LAS format), followed by quality assessment and quality control (QAQC) to obtain meaningful results. From the digitized geophysical data, density, neutron, and sonic logs are selected to mathematically derive porosity values that are then compared with the corresponding measured core porosity values for the same depth interval to determine the reliability of the respective log types. In this study, a strong positive correlation (R²=0.589) is observed between porosity computed from a density log (density log porosity) and the corresponding core porosity. Conversely, sonic log porosity and neutron porosity show weak (R2 = 0.1738) and very weak (R2 = 0.0574) positive correlation with the corresponding core porosity data. This finding can be attributed to different factors (e.g., the condition of the borehole walls and fluids, the type and limitations of the technology at different points in time, knowledge of formation variability for calculations), and as such requires more investigation. The density log measures the bulk density of the formation (solid and fluid phases), and as such the derived porosity values indicate total porosity i.e., interparticle (primary) pore spaces, and vugs and fractures (secondary) pore spaces. The sonic log measures the interval transit time of a compressional soundwave travelling through the formation. High quality first arrival waveforms usually correspond to a route in the borehole wall free of fractures and vugs, which ultimately result in the derived porosity reflecting only primary porosity. As molds, vugs and fractures contribute significantly to the total porosity of the Lockport Group and Salina A-1 Carbonate strata, sonic porosity may not reflect true bulk formation porosity. The neutron porosity log measures the hydrogen index in a formation as a proxy for porosity, however, the current limitations of neutron logging tool fail to account for formation-related complexities including: the gas effect, the chloride effect and the shale effect that can lead to over- or underestimation of formation porosity. As a result, the density log appears to be the most reliable geophysical log in the OGSRL archives for total porosity estimation in the Lockport Group and Salina A-1 Carbonate Unit. Nonetheless, sonic porosity can be combined with density porosity to determine secondary porosity, whereas a combination of density and neutron porosity logs can be used to identify gas-bearing zones.
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