Thematische Bibliographien / Geotechnical methods

Inhaltsverzeichnis

  1. Zeitschriftenartikel
  2. Dissertationen
  3. Bücher
  4. Buchteile
  5. Konferenzberichte
  6. Berichte der Organisationen

Auswahl der wissenschaftlichen Literatur zum Thema „Geotechnical methods“

Autor: Grafiati
Veröffentlicht am 28. Juni 2021
Zuletzt aktualisiert am 16. Februar 2022

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Zeitschriftenartikel zum Thema "Geotechnical methods"

1

CARR, J. R. „Probabilistic Methods in Geotechnical Engineering“. Environmental & Engineering Geoscience I, Nr. 1 (01.03.1995): 122–23. http://dx.doi.org/10.2113/gseegeosci.i.1.122.

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2

Hrubesova, Eva, und Marek Mohyla. „Back Analysis Methods in Geotechnical Engineering“. Advanced Materials Research 1020 (Oktober 2014): 423–28. http://dx.doi.org/10.4028/www.scientific.net/amr.1020.423.

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The paper deals with the back analysis method in geotechnical engineering, that goal is evaluation the more objective and reliable parameters of the rock mass on the basis of in-situ measurements. Stress, deformational, strength and rheological parameters of the rock mass are usually determined by some inaccuracies and errors arising from the complexity and variability of the rock mass. This higher or lower degree of imprecision is reflected in the reliability of the mathematical modelling results. The paper presents the utilization of direct optimization back analysis method, based on the theory of analytical functions of complex variable and Kolosov-Muschelischvili relations, to the evaluation of initial stress state inside the rock massif.
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3

Yuen, Ka-Veng, Jianye Ching und Kok-Kwang Phoon. „Bayesian Learning Methods for Geotechnical Data“. ASCE-ASME Journal of Risk and Uncertainty in Engineering Systems, Part A: Civil Engineering 7, Nr. 1 (März 2021): 02020002. http://dx.doi.org/10.1061/ajrua6.0001102.

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Pieczyńska-Kozłowska, Joanna M. „Comparison Between Two Methods for Estimating the Vertical Scale of Fluctuation for Modeling Random Geotechnical Problems“. Studia Geotechnica et Mechanica 37, Nr. 4 (01.12.2015): 95–103. http://dx.doi.org/10.1515/sgem-2015-0049.

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Abstract The design process in geotechnical engineering requires the most accurate mapping of soil. The difficulty lies in the spatial variability of soil parameters, which has been a site of investigation of many researches for many years. This study analyses the soil-modeling problem by suggesting two effective methods of acquiring information for modeling that consists of variability from cone penetration test (CPT). The first method has been used in geotechnical engineering, but the second one has not been associated with geotechnics so far. Both methods are applied to a case study in which the parameters of changes are estimated. The knowledge of the variability of parameters allows in a long term more effective estimation, for example, bearing capacity probability of failure.
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Muszynski, Mark R. „Incorporating Reliability Methods into Geotechnical Engineering Practice“. Journal of Performance of Constructed Facilities 23, Nr. 3 (Juni 2009): 130–31. http://dx.doi.org/10.1061/(asce)cf.1943-5509.0000035.

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6

Juang, C. Hsein, Jie Zhang, Mengfen Shen und Jinzheng Hu. „Probabilistic methods for unified treatment of geotechnical and geological uncertainties in a geotechnical analysis“. Engineering Geology 249 (Januar 2019): 148–61. http://dx.doi.org/10.1016/j.enggeo.2018.12.010.

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7

Abdellah, Wael Rashad Elrawy. „PRACTICAL APPLICATION OF STOCHASTIC METHODS IN GEOTECHNICAL ENGINEERING“. JES. Journal of Engineering Sciences 43, Nr. 1 (01.01.2015): 57–70. http://dx.doi.org/10.21608/jesaun.2015.115147.

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8

Lees, Andrew S. „Use of geotechnical numerical methods with Eurocode 7“. Proceedings of the Institution of Civil Engineers - Engineering and Computational Mechanics 170, Nr. 4 (Dezember 2017): 146–53. http://dx.doi.org/10.1680/jencm.17.00004.

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9

Bouin, Céline, Simon Weber, Yannic A. Ethier, Jean-Sébastien Dubé und François Duhaime. „On Preferred Saturation Methods for Geotechnical Flow Tests“. Geotechnical Testing Journal 44, Nr. 4 (18.08.2020): 20190181. http://dx.doi.org/10.1520/gtj20190181.

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10

Jürgens, H., und S. Henke. „The design of geotechnical structures using numerical methods“. IOP Conference Series: Earth and Environmental Science 727, Nr. 1 (01.04.2021): 012021. http://dx.doi.org/10.1088/1755-1315/727/1/012021.

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Dissertationen zum Thema "Geotechnical methods"

1

Sleiman, Maya. „2D Modelling of GeosyntheticallyReinforced Piled Embankments : Calibration Methods in PLAXIS 2D & Review of AnalyticalGuidelines“. Thesis, KTH, Jord- och bergmekanik, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-291424.

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This thesis focuses on the 2D modelling of Geosyntheticaly Reinforced Piled Embankments (GRPE) in PLAXIS 2D. In doing so, it explores two main aspects: 1) the calibration of Interface Stiffness Factors (ISFs) governing the soil-pile interaction of Embedded BeamRow (EBR) elements in PLAXIS 2D, and 2) the prospects and limitations of modelling geogrids (GR) in PLAXIS 2D when underlain by EBR elements; although several studies have validates the EBR element in modelling piles, none address the geogrid-EBR interaction and its implications on modelling GRPE systems. The thesis performs the calibration and validation processes using the full-scale GRPE structure ASIRI (Amélioration des Sols parInclusions Rigide) as documented in Briançon and Simon, 2012 and Nunez et al., 2013. Calibration of the EBR’s ISFs is done against 1) load-displacement curve of a test pile, 2)load-displacement of the structure’s monitored piles, and 3) differential soil-pile settlement. Model results for soil settlement, pile settlement, and pile load are then compared to reported values from the ASIRI site. Results show that the natural deviation between the structure and test pile’s load - displacement results in a wide range of possible calibration values for the ISFs, making calibration based on a test pile’s load-displacement curve an unpractical method. Even when such natural deviations were eliminated by calibrating the model against the structure’s reported values for pile load-displacement, model predictions for subsoil displacement were compromised. It is thus advisable to calibrate the EBR element with respect to soil settlement, pile settlement, and pile load rather than solely on a load-displacement curve as to avoid high divergences in soil-pile differential settlement. Modelling geogrids in GRPE systems, PLAXIS 2D underestimates GR strain due to its inability to simulate GR deflection: EBR elements are superimposed on top of a continuous soil mesh, thus allowing the embankment soil to settle through the EBR element. This unrealistically minimizes GR deflection, which underestimates GR strain when modelling GRPEs in PLAXIS 2D. In addition to validating the 2D modelling of GRPE systems, the thesis conducts a comparative literature review of GRPE design guidelines, focusing on the British BS8006 (2010), the German EBGEO (2011), and the Dutch CUR226 (2016). It then applies the latter two to the ASIRI full scale case study and compares results for predicted maximum GR strainand displacement to those from the PLAXIS 2D model and ASIRI measurements. The literature review shows that the geogrid load distribution is highly dependent on the state of subsoil support, where a uniform distribution is more appropriate for high subsoil support, and an inverse-triangular one more appropriate for low subsoil support. However, the analytical analysis of the ASIRI case shows that the triangular distribution, previously dismissed as unrealistic by the literature review, gives satisfactory results due to a combination of soil sliding and high subsoil support at the ASIRI site.
Examensarbetet utvärderar 2D modellering av bankpålning med geosyntetisk armering (Geosyntheticallt Reinforced Piled Embankments – GRPE) i PLAXIS 2D. Examensarbetet utforskar två huvudaspekter: 1) kalibrering av Interface Stiffness Factors (ISFs) som styrjord-påle samspelet av Embedded Beam Row (EBR) element i PLAXIS 2D, och 2) möjligheter och begränsningar vid modellering av geonät i PLAXIS 2D när de ligger över EBR element. Även om flera studier har validerat användningen av EBR element för modelleringenav pålning, har inga behandlat samspelet geonät-EBR samt dess implikationer på modelleringen av GRPE. I arbetet har kalibrerings- och valideringsprocesser genomförts genom att använda den fullskaliga GRPE strukturen ASIRI (Amélioration des Sols par Inclusions Rigide) som dokumenterats i Briançon och Simon(2012) samt Nunez et al. (2013). Kalibrering av EBR ISFshar utförts mot: 1) last/förskjutningssamband av testpålar, 2) last/förskjutningssambad av övervakade pålar i strukturen, och 3) jord-påle differenssättningen. Modellens resultat försättningar i jorden, deformation i pålarna och lasten i pålarna jämförs med mätningar från ASIRI. Resultaten visar att naturliga avvikelser mellan strukturens- och testpålens last/förskjutningssambad resulterar i ett brett spektrum av möjliga kalibreringsvärden för ISFs, som gör kalibrering mot testpålens last/förskjutningssambad opraktisk. Även vid justering för detta genom kalibrering mot strukturpålens last/förskjutningssambad minskade modellens noggrannhet för sättningar i jorden. Det är således lämpligt att kalibrera EBR element motsättningar i jorden, deformation i pålarna och lasten i pålarna i stället för bara last/förskjutningssambaden för att undvika hög divergens i differenssättningen jord-påle. Vid modellering av GRPE-geonät underskattar PLAXIS 2D töjningen i geonäten på grund av sin oförmåga att simulera geonätens utböjning. EBR element ligger över ett kontinuerligt beräkningsnät av jord (soil mesh) som tillåter bankfyllningen att sätta genom EBRelement. Detta förhindrar utböjningen i geonätet som resulterar i en underskattning av töjningen i nätet vid modellering av GRPE i PLAXIS 2D. Förutom validering av 2D modelleringen av GRPE strukturer utför examensarbetet en jämförande literaturstudie av GRPE dimensioneringsriktlinjer med fokus på Brittisk BS8006 (2010), Tysk EBGEO (2011), och Nederländsk CUR226 (2016). De två sista nämnda riktlinjerna tillämpas på ASIRI för att prognosticera maximum geonättöjning och utböjning. Beräkningsresultat jämförs med värden från PLAXIS 2D modellen och mätningar från ASIRI. Litteraturstudien visar att geonätens belastningsfördelning är beroende främst på stödet från den underliggande jorden. Likformig belastningsfördelningen är lämpligare för en hög stödnivå och en invers-triangulär belastningsfördelningen för en låg stödnivå. Dock visar den analytiska analysen av ASIRI strukturen att en triangulär belastningsfördelning, som ansågs vara orealistisk i litteraturstudien, ger tillfredsställande resultat. Det är på grund av kombinationen av ’jordensglidning’ och hög stödnivå från den underliggandejorden i ASIRI:s fall.
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2

Sleiman, Maya. „2D Modelling of Geosynthetically Reinforced Piled Embankments : Calibration Methods in PLAXIS 2D & Review of Analytical Guidelines“. Thesis, KTH, Jord- och bergmekanik, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-291424.

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This thesis focuses on the 2D modelling of Geosyntheticaly Reinforced Piled Embankments (GRPE) in PLAXIS 2D. In doing so, it explores two main aspects: 1) the calibration of Interface Stiffness Factors (ISFs) governing the soil-pile interaction of Embedded BeamRow (EBR) elements in PLAXIS 2D, and 2) the prospects and limitations of modelling geogrids (GR) in PLAXIS 2D when underlain by EBR elements; although several studies have validates the EBR element in modelling piles, none address the geogrid-EBR interaction and its implications on modelling GRPE systems. The thesis performs the calibration and validation processes using the full-scale GRPE structure ASIRI (Amélioration des Sols parInclusions Rigide) as documented in Briançon and Simon, 2012 and Nunez et al., 2013. Calibration of the EBR’s ISFs is done against 1) load-displacement curve of a test pile, 2)load-displacement of the structure’s monitored piles, and 3) differential soil-pile settlement. Model results for soil settlement, pile settlement, and pile load are then compared to reported values from the ASIRI site. Results show that the natural deviation between the structure and test pile’s load - displacement results in a wide range of possible calibration values for the ISFs, making calibration based on a test pile’s load-displacement curve an unpractical method. Even when such natural deviations were eliminated by calibrating the model against the structure’s reported values for pile load-displacement, model predictions for subsoil displacement were compromised. It is thus advisable to calibrate the EBR element with respect to soil settlement, pile settlement, and pile load rather than solely on a load-displacement curve as to avoid high divergences in soil-pile differential settlement. Modelling geogrids in GRPE systems, PLAXIS 2D underestimates GR strain due to its inability to simulate GR deflection: EBR elements are superimposed on top of a continuous soil mesh, thus allowing the embankment soil to settle through the EBR element. This unrealistically minimizes GR deflection, which underestimates GR strain when modelling GRPEs in PLAXIS 2D. In addition to validating the 2D modelling of GRPE systems, the thesis conducts a comparative literature review of GRPE design guidelines, focusing on the British BS8006 (2010), the German EBGEO (2011), and the Dutch CUR226 (2016). It then applies the latter two to the ASIRI full scale case study and compares results for predicted maximum GR strainand displacement to those from the PLAXIS 2D model and ASIRI measurements. The literature review shows that the geogrid load distribution is highly dependent on the state of subsoil support, where a uniform distribution is more appropriate for high subsoil support, and an inverse-triangular one more appropriate for low subsoil support. However, the analytical analysis of the ASIRI case shows that the triangular distribution, previously dismissed as unrealistic by the literature review, gives satisfactory results due to a combination of soil sliding and high subsoil support at the ASIRI site.
Examensarbetet utvärderar 2D modellering av bankpålning med geosyntetisk armering (Geosyntheticallt Reinforced Piled Embankments – GRPE) i PLAXIS 2D. Examensarbetet utforskar två huvudaspekter: 1) kalibrering av Interface Stiffness Factors (ISFs) som styrjord-påle samspelet av Embedded Beam Row (EBR) element i PLAXIS 2D, och 2) möjligheter och begränsningar vid modellering av geonät i PLAXIS 2D när de ligger över EBR element. Även om flera studier har validerat användningen av EBR element för modelleringenav pålning, har inga behandlat samspelet geonät-EBR samt dess implikationer på modelleringen av GRPE. I arbetet har kalibrerings- och valideringsprocesser genomförts genom att använda den fullskaliga GRPE strukturen ASIRI (Amélioration des Sols par Inclusions Rigide) som dokumenterats i Briançon och Simon(2012) samt Nunez et al. (2013). Kalibrering av EBR ISFshar utförts mot: 1) last/förskjutningssamband av testpålar, 2) last/förskjutningssambad av övervakade pålar i strukturen, och 3) jord-påle differenssättningen. Modellens resultat försättningar i jorden, deformation i pålarna och lasten i pålarna jämförs med mätningar från ASIRI. Resultaten visar att naturliga avvikelser mellan strukturens- och testpålens last/förskjutningssambad resulterar i ett brett spektrum av möjliga kalibreringsvärden för ISFs, som gör kalibrering mot testpålens last/förskjutningssambad opraktisk. Även vid justering för detta genom kalibrering mot strukturpålens last/förskjutningssambad minskade modellens noggrannhet för sättningar i jorden. Det är således lämpligt att kalibrera EBR element motsättningar i jorden, deformation i pålarna och lasten i pålarna i stället för bara last/förskjutningssambaden för att undvika hög divergens i differenssättningen jord-påle. Vid modellering av GRPE-geonät underskattar PLAXIS 2D töjningen i geonäten på grund av sin oförmåga att simulera geonätens utböjning. EBR element ligger över ett kontinuerligt beräkningsnät av jord (soil mesh) som tillåter bankfyllningen att sätta genom EBRelement. Detta förhindrar utböjningen i geonätet som resulterar i en underskattning av töjningen i nätet vid modellering av GRPE i PLAXIS 2D. Förutom validering av 2D modelleringen av GRPE strukturer utför examensarbetet en jämförande literaturstudie av GRPE dimensioneringsriktlinjer med fokus på Brittisk BS8006 (2010), Tysk EBGEO (2011), och Nederländsk CUR226 (2016). De två sista nämnda riktlinjerna tillämpas på ASIRI för att prognosticera maximum geonättöjning och utböjning. Beräkningsresultat jämförs med värden från PLAXIS 2D modellen och mätningar från ASIRI. Litteraturstudien visar att geonätens belastningsfördelning är beroende främst på stödet från den underliggande jorden. Likformig belastningsfördelningen är lämpligare för en hög stödnivå och en invers-triangulär belastningsfördelningen för en låg stödnivå. Dock visar den analytiska analysen av ASIRI strukturen att en triangulär belastningsfördelning, som ansågs vara orealistisk i litteraturstudien, ger tillfredsställande resultat. Det är på grund av kombinationen av ’jordensglidning’ och hög stödnivå från den underliggandejorden i ASIRI:s fall.
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Bhamidipati, Raghava A. „Use Of Laboratory Geophysical And Geotechnical Investigation Methods To Characterize Gypsum Rich Soils“. UKnowledge, 2016. http://uknowledge.uky.edu/ce_etds/45.

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Gypsum rich soils are found in many parts of the world, particularly in arid and semi-arid regions. Most gypsum occurs in the form of evaporites, which are minerals that precipitate out of water due to a high rate of evaporation and a high mineral concentration. Gypsum rich soils make good foundation material under dry conditions but pose major engineering hazards when exposed to water. Gypsum acts as a weak cementing material and has a moderate solubility of about 2.5 g/liter. The dissolution of gypsum causes the soils to undergo unpredictable collapse settlement leading to severe structural damages. The damages incur heavy financial losses every year. The objective of this research was to use geophysical methods such as free-free resonant column testing and electrical resistivity testing to characterize gypsum rich soils based on the shear wave velocity and electrical resistivity values. The geophysical testing methods could provide quick, non-intrusive and cost-effective methodologies to screen sites known to contain gypsum deposits. Reconstituted specimens of ground gypsum and quartz sand were prepared in the laboratory with varying amounts of gypsum and tested. Additionally geotechnical tests such as direct shear strength tests and consolidation tests were conducted to estimate the shear strength parameters (drained friction angle and cohesion) and the collapse potential of the soils. The effect of gypsum content on the geophysical and geotechnical parameters of soil was of particular interest. It was found that gypsum content had an influence on the shear wave velocity but had minimal effect on electrical resistivity. The collapsibility and friction angle of the soil increased with increase in gypsum. The information derived from the geophysical and geotechnical tests was used to develop statistical design equations and correlations to estimate gypsum content and soil collapse potential.
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Holmström, Robin, und Dmytro Yakubov. „Evaluation of future trial embankments : A study of measurement methods to apply on Lampen test embankments, Kalix, Sweden“. Thesis, Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-62824.

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At the Lampen site outside of Kalix, Sweden two embankments with heights 1,5m and 2m have been built to study and test the properties of sulfide soil that is located in the Gulf of Bothnia coastal areas. In this master thesis investigations have been done on what more could be done at the Lampen site today concerning new technics, measurements, observations and calculations etc. rather than building new embankments. Conclusions have been drawn from a total of 7 cases including Lampen what more could be done at the Lampen site. Verifications have also been done on the work made at the different cases. It was concluded that the work on all the different cases could be verified in some way against hand calculations or PLAXIS models beside the Murro test embankment site because this work had too little release data aterial given. Made verifications gave corresponding results to the described and measured ones in the real cases. Cases that have been looked at are: 􀀀 Murro test embankment (Karstunen et.al, 2005) 􀀀 Test embankment constructed to failure on soft marine clay in Malaysia (Brand, 1991) 􀀀 Test embankment on hydraulically placed PFA (Pulverized Fuel Ashes) in the United Kingdom (Cousens, et al., 2003) 􀀀 Trial Embankment on peat in Booneschans the Netherlands (Zwanenburg, et al., 2012) 􀀀 A case study on sulphide soil on road of E12 north link, Västerslätt, Umeå, Sweden (Törnqvist, 2013) 􀀀 Follow up and evaluation of settlements on the road 760 in Norrbotten, Sweden (Johansson, 2010) 􀀀 Test Embankments Lampen, Sweden (Andersson, 2012) From these cases it was concluded that more calculations in Plaxis 2D, Plaxis 3D and maybe Geosuite settlements software programs should be done at the Lampen site, both for long term and short term behavior and settlements as the only current model made is an Embacko V1.02 which is based on the work and results by Andersson (2012). Also verifications should be made by hand calculations on the models as this had not been done until today. Further disturbed samples should have been taken at the Lampen site as it have been done at the Murro site in Finland as this site is built on similar ground conditions with sulfide soil. Heavy equipment used at the site and as well the building of the embankments might have disturb or influenced the soil so the properties might have been changed. Also a couple of new measurement technics have been looked at for Lampen. The looked at technics are optics fibers, drones and ShapeAccelArray (SAA). ShapeAccelArray (SAA) devices could be installed at some different points on the site, down through the soil profile to give better readings on vibrations, accelerations, deformations and settlements. A drone could also be used during the snow free period to fly daily-predefined paths and make a 3D mapping of the geotechnical structures. And if the embankments would be built now again from the start it would be a good idea to install from the start a smart geotextile with polymer optical fibers (POF) totally covering the whole embankment size. This would give continues reading on deformations and displacements. But since the measurements and all other work at the Lampen site in the project went well and gave good results there is no need to do further changes.
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Santos, Rodríguez Cristian de. „Backanalysis methodology based on multiple optimization techniques for geotechnical problems“. Doctoral thesis, Universitat Politècnica de Catalunya, 2015. http://hdl.handle.net/10803/334179.

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Nowadays, thanks to the increase of computers capability to solve huge and complex problems, and also thanks to the endless effort of the geotechnical community to define better and more sophisticated constitutive models, the challenge to predict and simulate soil behavior has been eased. However, due to the increase in that sophistication, the number of parameters that define the problem has also increased. Moreover, frequently, some of those parameters do not have a real geotechnical meaning as they just come from mathematical expressions, which makes them difficult to identify. As a consequence, more effort has to be placed on parameters identification in order to fully define the problem. This thesis aims to provide a methodology to facilitate the identification of parameters of soil constitutive models by backanalysis. The best parameters are defines as those that minimize an objective function based on the differences between measurements and computed values. Different optimization techniques have been used in this study, from the most traditional ones, such as the gradient based methods, to the newest ones, such as adaptive genetic algorithms and hybrid methods. From this study, several recommendations have been put forward in order to take the most advantage of each type of optimization technique. Along with that, an extensive analysis has been carried out to determine the influence on soil parameters identification of what to measure, where to measure and when to measure in the context of tunneling. The Finite Element code Plaxis has been used as a tool for the direct analysis. A FORTRAN code has been developed to automate the entire backanalysis procedure. The Hardening Soil Model (HSM) has been adopted to simulate the soil behavior. Several soil parameters of the HSM implemented in Plaxis, such as E_50^ref, E_ur^ref, c and f, have been identified for different geotechnical scenarios. First, a synthetic tunnel case study has been used to analyze all the different approaches that have been proposed in this thesis. Then, two complex real cases of a tunnel construction (Barcelona Metro Line 9) and a large excavation (Girona High-Speed Railway Station) have been presented to illustrate the potential of the methodology. Special focus on the influence of construction procedures and instruments error structure has been placed for the tunnel backanalysis, whereas in the station backanalysis, more effort has been devoted to the potential of the concept of adaptive design by backanalysis. Moreover, another real case, involving a less conventional geotechnical problem, such as Mars surface exploratory rovers, has been also presented to test the backanalysis methodology and the reliability of the Wong & Reece wheel-terrain model; widely adopted by the terramechanics community, but nonetheless, still not fully accepted when analyzing lightweight rovers as the ones that have been used in recent Mars exploratory missions.
Actualmente, gracias al aumento de la capacidad de los ordenadores para resolver problemas grandes y complejos, y gracias también al gran esfuerzo de la comunidad geotécnica de definir mejores y más sofisticados modelos constitutivos, se ha abordado el reto de predecir y simular el comportamiento del terreno. Sin embargo, debido al aumento de esa sofisticación, también ha aumentado el número de parámetros que definen el problema. Además, frecuentemente, muchos de esos parámetros no tienen un sentido geotécnico real dado que vienen directamente de expresiones puramente matemáticas, lo cual dificulta su identificación. Como consecuencia, es necesario un mayor esfuerzo en la identificación de los parámetros para poder definir apropiadamente el problema. Esta tesis pretende proporcionar una metodología que facilite la identificación mediante el análisis inverso de los parámetros de modelos constitutivos del terreno. Los mejores parámetros se definen como aquellos que minimizan una función objetivo basada en la diferencia entre medidas y valores calculados. Diferentes técnicas de optimización han sido utilizadas en este estudio, desde las más tradicionales, como los métodos basados en el gradiente, hasta las más modernas, como los algoritmos genéticos adaptativos y los métodos híbridos. De este estudio, se han extraído varias recomendaciones para sacar el mayor provecho de cada una de las técnicas de optimización. Además, se ha llevado a cabo un análisis extensivo para determinar la influencia sobre qué medir, dónde medir y cuándo medir en el contexto de la excavación de un túnel. El código de Elementos Finitos Plaxis ha sido utilizado como herramienta de cálculo del problema directo. El desarrollo de un código FORTRAN ha sido necesario para automatizar todo el procedimiento de Análisis Inverso. El modelo constitutivo de Hardening Soil ha sido adoptado para simular el comportamiento del terreno. Varios parámetros del modelo constitutivo de Hardening implementado en Plaxis, como E_50^ref, E_ur^ref, c y f, han sido identificados para diferentes escenarios geotécnicos. Primero, se ha utilizado un caso sintético de un túnel donde se han analizado todas las distintas técnicas que han sido propuestas en esta tesis. Después, dos casos reales complejos de una construcción de un túnel (Línea 9 del Metro de Barcelona) y una gran excavación (Estación de Girona del Tren de Alta Velocidad) se han presentado para ilustrar el potencial de la metodología. Un enfoque especial en la influencia del procedimiento constructivo y la estructura del error de las medidas se le ha dado al análisis inverso del túnel, mientras que en el análisis inverso de la estación el esfuerzo se ha centrado más en el concepto del diseño adaptativo mediante el análisis inverso. Además, otro caso real, algo menos convencional en términos geotécnicos, como es la exploración de la superficie de Marte mediante robots, ha sido presentado para examinar la metodología y la fiabilidad del modelo de interacción suelo-rueda de Wong y Reece; extensamente adoptado por la comunidad que trabajo en Terramecánica, pero aún no totalmente aceptada para robots ligeros como los que se han utilizado recientemente en las misiones de exploración de Marte.
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Salehian, Ali. „PREDICTING THE DYNAMIC BEHAVIOR OF COAL MINE TAILINGS USING STATE-OF-PRACTICE GEOTECHNICAL FIELD METHODS“. UKnowledge, 2013. http://uknowledge.uky.edu/ce_etds/9.

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This study is focused on developing a method to predict the dynamic behavior of mine tailings dams under earthquake loading. Tailings dams are a by-product of coal mining and processing activities. Mine tailings impoundments are prone to instability and failure under seismic loading as a result of the mechanical behavior of the tailings. Due to the existence of potential seismic sources in close proximity to the coal mining regions in the United States, it is necessary to assess the post-earthquake stability of these tailings dams. To develop the aforementioned methodology, 34 cyclic triaxial tests along with vane shear tests were performed on undisturbed mine tailings specimens from two impoundments in Kentucky. Therefore, the liquefaction resistance and the residual shear strength of the specimens were measured. The laboratory cyclic strength curves for the coal mine specimens were produced, and the relationship between plasticity, density, cyclic stress ratio, and number of cycles to liquefaction were identified. The samples from the Big Branch impoundment were generally loose samples, while the Abner Fork specimens were dense samples, older and slightly cemented. The data suggest that the number of loading cycles required to initiate liquefaction in mine tailings, NL, decreases with increasing CSR and with decreasing density. This trend is similar to what is typically observed in soil. For a number of selected specimens, using the results of a series of small-strain cyclic triaxial tests, the shear modulus reduction curves and damping ratio plots were created. The data obtained from laboratory experiments were correlated to the previously recorded geotechnical field data from the two impoundments. The field parameters including the SPT blow counts (N1)60, corrected CPT cone tip resistance (qt), and shear wave velocity (vs), were correlated to the laboratory measured cyclic resistance ratio (CRR). The results indicate that in general, the higher the (N1)60 and the tip resistance (qt), the higher the CSR was. Ultimately, practitioners will be able to use these correlations along with common state-of-practice geotechnical field methods to predict cyclic resistance in fine tailings to assess the liquefaction potential and post-earthquake stability of the impoundment structures.
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Katsigiannis, Georgios. „Modern geotechnical codes of practice and new design challenges using numerical methods for supported excavations“. Thesis, University College London (University of London), 2017. http://discovery.ucl.ac.uk/10037673/.

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Eurocode 7 (EC7), which is the geotechnical engineering design standard in Europe, introduces the concept of partial safety factors and distinguishes between Serviceability Limit State (SLS) and Ultimate Limit State (ULS). While EC7 allows the use of Finite Element Methods (FEM) for ULS, there is limited guidance in a number of issues. The thesis focuses on a number of constitutive models of increasing complexity and both the characteristic and design values of the model parameters are derived for the London Clay and a soft Marine clay. The challenges associated with factoring the undrained shear strength when using total and effective stress parameters are discussed. The use of FEM for ULS design of supported excavations, is highlighted using simple excavation examples and two deep excavation case histories; the Moorgate Crossrail Station and the Exhibition Road Building of the Victoria & Albert Museum. The different factoring combinations and strategies, required by EC7, are compared in terms of the calculated design internal structural forces, illustrating that the use of more advanced models can have significant advantages. Moreover, comparisons are made between the design prop loads calculated from the FEM and a number of empirical methods. The HYD limit state, as described in EC7, relates to the upward flow of water through the soil towards a free surface. The HYD verification, using FEM, can be performed with two approaches; the soil block approach by calculating the equilibrium of a rectangular soil block and the integration point approach by checking that the equilibrium is satisfied at each integration point. Thorough comparisons between the two approaches using benchmark geometries illustrate the benefits of using more advanced approaches for such stability verifications.
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Kane, William F. „Geologic and geotechnical controls on the stability of coal mine entries“. Diss., Virginia Polytechnic Institute and State University, 1985. http://hdl.handle.net/10919/64668.

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Roof and rib failures in underground coal mines are one of the major problems facing the industry today. In addition to safety considerations, the resulting economic impact of such failures is staggering. Uncovering and replacing buried and damaged equipment and clearing entries can account for a large expenditure in lost man-hours and machinery. Yet, because of the complex nature of their formation, geological variability, and structural characteristics, coal mine roof strata are one of the least controllable of all mine design parameters. This is especially true along the leading (southeastern) edge of the Appalachian coalfields where considerable faulting and movement have contributed to hazardous coal mining roof conditions. For this research, a detailed study of several mines, in the southern Appalachian coalfields, was undertaken to determine the most prominent geomechanical factors affecting roof stability and to evaluate their influence in promoting unstable ground conditions. In order to accomplish this task, the major geological and geomechanical features found to be detrimental to the coal mine roof within the Appalachian basin were identified and mapped in four Virginia mines. Statistical processing by chi-square and linear regression analysis as well as analytical analysis by the finite element method were used to determine the influence of geology, mine-layout, and support methods on roof stability. It was found that some easily determined parameters can be successfully used to predict potentially unstable areas. A simplified roof classification system was developed based on the geomechanical parameters, which can be used to assess the stability of a particular roof type. A Roof Rating Index was also devised capable of expressing the probability of failure under a given set of geomechanical conditions.
Ph. D.
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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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Arens, Kevin C. „Remediation Methods for Subgrade Settlements of Existing Roadways: Lifetime Cost-Benefit Analysis“. University of Dayton / OhioLINK, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=dayton1575537943683836.

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Bücher zum Thema "Geotechnical methods"

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Griffiths, D. V., und Gordon A. Fenton, Hrsg. Probabilistic Methods in Geotechnical Engineering. Vienna: Springer Vienna, 2007. http://dx.doi.org/10.1007/978-3-211-73366-0.

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Shehata, Hany, und Chandrakant S. Desai, Hrsg. Advances in Numerical Methods in Geotechnical Engineering. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-01926-6.

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Cividini, Annamaria, Hrsg. Application of Numerical Methods to Geotechnical Problems. Vienna: Springer Vienna, 1998. http://dx.doi.org/10.1007/978-3-7091-2512-0.

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Conference on Probabilistic Methods in Geotechnical Engineering (1993 Canberra, A.C.T.). Probabilistic methods in geotechnical engineering: Proceedings of the Conference on Probabilistic Methods in Geotechnical Engineering, Canberra, Australia, 10-12 February 1993. Rotterdam: A.A. Balkema, 1993.

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Campbell, DeWayne A. Probabilistic methods in geotechnical engineering: An introduction for the uninitiated. Denver, Colo: Geotechnical Branch, Division of Research and Laboratory Services, Engineering and Research Center, 1985.

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European Conference on Numerical Methods in Geotechnical Engineering (3rd 1994 Manchester, England). Numerical methods in geotechnical engineering: Proceedings of the Third European Conference on Numerical Methods in Geotechnical Engineering : ECONMIG 94, Manchester, UK, 7-9 September 1994. Rotterdam: A.A. Balkema, 1994.

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Annamaria, Cividini, und International Centre for Mechanical Sciences., Hrsg. Application of numerical methods to geotechnical problems: Proceedings of the fourth European conference on Numerical Methods in Geotechnical Engineering, NUMGE98, Udine, Italy, October 14-16, 1998. Wien: Springer, 1998.

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Bhatta, Basudeb. Research Methods in Remote Sensing. Dordrecht: Springer Netherlands, 2013.

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9

1953-, Filz George Michael, Griffiths D. V und American Society of Civil Engineers. Geo-Institute. Computer Applications Committee, Hrsg. Numerical methods in geotechnical engineering: Recent developments : proceedings of sessions of Geo-Denver 2000 : August 5-8, 2000, Denver, Colorado. Reston, Va: American Society of Civil Engineers, 2000.

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Bruce, Donald A. An introduction to the deep soil mixing methods as used in geotechnical applications. McLean, VA: U.S. Dept. of Transportation, Federal Highway Administration, Research, Development, and Technology, Turner-Fairbank Highway Research Center, 2000.

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Buchteile zum Thema "Geotechnical methods"

1

Sungwan, Song, Kang Byeongju, Kim Hanseam und Cho Wanjei. „Geotechnical Information Construction Methods for Liquefaction Assessment“. In Lecture Notes in Civil Engineering, 1093–97. Singapore: Springer Singapore, 2019. http://dx.doi.org/10.1007/978-981-15-2184-3_142.

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Smith, I. M. „Parallel Coupled Analyses in Geotechnical Engineering“. In Application of Numerical Methods to Geotechnical Problems, 25–34. Vienna: Springer Vienna, 1998. http://dx.doi.org/10.1007/978-3-7091-2512-0_2.

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Schweiger, H. F. „Results from Two Geotechnical Benchmark Problems“. In Application of Numerical Methods to Geotechnical Problems, 645–54. Vienna: Springer Vienna, 1998. http://dx.doi.org/10.1007/978-3-7091-2512-0_62.

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Li, Yanrong. „Comparison of test methods for soil“. In Handbook of Geotechnical Testing, 319–90. First edition. | Boca Raton : CRC Press/Taylor & Francis Group, [2020]: CRC Press, 2019. http://dx.doi.org/10.1201/9780429323744-12.

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Sanyal, Tapobrata. „Jute Geotextile Standards, Properties, and Test Methods“. In Developments in Geotechnical Engineering, 127–40. Singapore: Springer Singapore, 2016. http://dx.doi.org/10.1007/978-981-10-1932-6_11.

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Aydınoğlu, M. Nuray, Matej Fischinger, Tatjana Isaković, Andreas J. Kappos und Rui Pinho. „Methods for Inelastic Analysis of Bridges“. In Geotechnical, Geological and Earthquake Engineering, 85–128. Dordrecht: Springer Netherlands, 2012. http://dx.doi.org/10.1007/978-94-007-3943-7_3.

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Monnet, Jacques. „Soil and Rock Sampling Methods“. In In Situ Tests in Geotechnical Engineering, 7–38. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2015. http://dx.doi.org/10.1002/9781119145592.ch2.

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Tran, Chi. „Meta-concept and Intelligent Data Processing in the Geotechnical Fields“. In Advanced Computational Methods for Knowledge Engineering, 169–86. Heidelberg: Springer International Publishing, 2013. http://dx.doi.org/10.1007/978-3-319-00293-4_14.

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Scheuermann, Alexander, Thierry Bore, Partha Narayan Mishra, Habibullah Bhuyan, Guanxi Yan, Tilman Bittner und Rolf Becker. „Quantification of Soil State Variables Using Electromagnetic Methods“. In Developments in Geotechnical Engineering, 447–56. Singapore: Springer Singapore, 2018. http://dx.doi.org/10.1007/978-981-10-7721-0_28.

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Campanella, R. G., M. P. Davies, T. J. Boyd und J. L. Everard. „In-situ testing methods for groundwater contamination studies“. In Developments in Geotechnical Engineering, 371–79. London: CRC Press, 2021. http://dx.doi.org/10.1201/9781003211013-31.

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Konferenzberichte zum Thema "Geotechnical methods"

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Suzuki, Yusuke, und Rune Dyvik. „Comparisons of Two Reconstitution Methods for Clay Specimens“. In Geotechnical Frontiers 2017. Reston, VA: American Society of Civil Engineers, 2017. http://dx.doi.org/10.1061/9780784480472.037.

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Dreyer, C. B., O. R. Walton, Dan Scheld, Terry Gamber, Logan Knowles, David Hall und Jefferey Hayden. „Evaluating Geotechnical Characterization Methods for NEOs“. In Earth and Space 2014. Reston, VA: American Society of Civil Engineers, 2015. http://dx.doi.org/10.1061/9780784479179.004.

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Rubin, Aaron J., und Carlton L. Ho. „A Review of Two Methods to Model the Thermal Conductivity of Sands“. In Geotechnical Frontiers 2017. Reston, VA: American Society of Civil Engineers, 2017. http://dx.doi.org/10.1061/9780784480472.085.

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Oh, Hyunjun, und James M. Tinjum. „Comparison of Two Laboratory Methods for Measuring the Critical Temperature of Sandy Soils“. In Geotechnical Frontiers 2017. Reston, VA: American Society of Civil Engineers, 2017. http://dx.doi.org/10.1061/9780784480472.086.

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Khodadadi, T. Hamed, Edward Kavazanjian und Huriye Bilsel. „Mineralogy of Calcium Carbonate in MICP-Treated Soil Using Soaking and Injection Treatment Methods“. In Geotechnical Frontiers 2017. Reston, VA: American Society of Civil Engineers, 2017. http://dx.doi.org/10.1061/9780784480441.021.

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Niehoff, James W. „The Use of Geophysical Methods to Detect Abandoned Mine Workings“. In Biennial Geotechnical Seminar 2010. Reston, VA: American Society of Civil Engineers, 2010. http://dx.doi.org/10.1061/41144(391)11.

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Al-Dakheeli, Hussein, Rifat Bulut, Charles Aubeny und Robert Lytton. „Comparison between the Permeability and Diffusivity Function Derived from Different Methods of Unsaturated Expansive Soils“. In Geotechnical Frontiers 2017. Reston, VA: American Society of Civil Engineers, 2017. http://dx.doi.org/10.1061/9780784480441.015.

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Boone, M. D., R. J. Williams und M. R. Lewis. „Liquefaction Case History: Comparing Methods“. In Geotechnical and Structural Engineering Congress 2016. Reston, VA: American Society of Civil Engineers, 2016. http://dx.doi.org/10.1061/9780784479742.123.

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Karatzia, Xenia, und George Mylonakis. „GEOTECHNICAL SEISMIC ISOLATION USING EPS GEOFOAM AROUND PILES“. In 6th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering Methods in Structural Dynamics and Earthquake Engineering. Athens: Institute of Structural Analysis and Antiseismic Research School of Civil Engineering National Technical University of Athens (NTUA) Greece, 2017. http://dx.doi.org/10.7712/120117.5475.17924.

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Christian, J. T. „Geotechnical Acceptance of Limit State Design Methods“. In Proceedings of the International Workshop. WORLD SCIENTIFIC, 2003. http://dx.doi.org/10.1142/9789812704252_0002.

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Berichte der Organisationen zum Thema "Geotechnical methods"

1

Fritz, Bradley G., Douglas McFarland, William Hertz und Jeffrey Gamey. Application of Magnetic and Geotechnical Methods for Archaeological Site Investigations. Fort Belvoir, VA: Defense Technical Information Center, Juli 2011. http://dx.doi.org/10.21236/ada551819.

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