Bibliographies thématiques / Preconsolidation stress

Littérature scientifique sur le sujet « Preconsolidation stress »

Auteur : Grafiati
Publié le 10 mars 2023

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Articles de revues sur le sujet "Preconsolidation stress"

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Grozic, J. L. H., T. Lunne et S. Pande. « An oedometer test study on the preconsolidation stress of glaciomarine clays ». Canadian Geotechnical Journal 40, no 5 (1 octobre 2003) : 857–72. http://dx.doi.org/10.1139/t03-043.

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Stress history is usually determined by interpreting the results of oedometer tests to obtain the preconsolidation stress using traditional methods such as those proposed by Casagrande and Janbu. Both these methods are based on the assumption that the soil experiences a change in stiffness, from a stiff response to a soft response, close to the preconsolidation stress. Disturbed soils, however, especially overconsolidated clays of low plasticity, exhibit a soft response at low stresses, thereby making the interpretation of oedometer tests using traditional methods extremely difficult. Using data mainly from the Haltenbanken area, offshore Norway, a study was undertaken to investigate the various methods and testing procedures available to determining stress history. Oedometer verification tests were also performed on reconstituted specimens to compare interpreted values with the actual applied preconsolidation stress. This paper describes the results of the study by illustrating the variation in the interpretation methods and testing procedures used to determine preconsolidation stress.Key words: preconsolidation stress, yield stress, overconsolidated, low plastic clays, oedometer test, stress history.
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Peri, Elena, Lars Bo Ibsen et Benjaminn Nordahl Nielsen. « How to interpret consolidation and creep in Yoldia clay ». E3S Web of Conferences 92 (2019) : 05005. http://dx.doi.org/10.1051/e3sconf/20199205005.

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The aim of this paper is to define a guideline for an objective interpretation of oedometer tests on Yoldia clay. The approach followed consists in a first analysis where the separation of strains is applied to the consolidation curves. During this phase, primary consolidation strains are filtered from creep by using Brinch-Hansen, Taylor and ANACONDA method. The second phase of the interpretation aims to determine the preconsolidation stress according to three different theories (Akai, Janbu and Casagrande - Terzaghi). The preconsolidation stress values, as well as the consolidation curves, are slightly influenced by the separation of strains method applied, while using different preconsolidation stress theories deeply affects the final results.
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Shao, Yan, Chang Yong Li et Yuan Wei. « Determining Preconsolidation Pressure of the Lakeside New District Soft Clay of Hefei Based on Casagrande Method by Matlab ». Applied Mechanics and Materials 291-294 (février 2013) : 1113–16. http://dx.doi.org/10.4028/www.scientific.net/amm.291-294.1113.

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The preconsolidation pressure is an important index to determine the stress history of soil and also a major calculation parameter for the analysis of soil stratum’s deformation in the different stress history. Casagrade method is worldwide applied to determine the preconsolidation pressure. On the basis of research on consolidation test about the lakeside new district soft clay of Hefei by high pressure consolidation apparatus, and conformed to Casagrande method, the paper adopts quartic polynomial and least square method to fit the compression curve, and the preconsolidation pressure of the lakeside new distract soft clay of Hefei is determined by matlab software. The result provides reference for the calculation of foundation settlement considering stress history.
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Xu, Yali, Panpan Guo, Chengwei Zhu, Gang Lei et Kang Cheng. « Experimental Investigation into Compressive Behaviour and Preconsolidation Pressure of Structured Loess at Different Moisture Contents ». Geofluids 2021 (20 mars 2021) : 1–9. http://dx.doi.org/10.1155/2021/5585392.

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This paper investigates the influence of the structured property of loess on its compressive behaviour and proposes a new method for determining the preconsolidation pressure of structured loess soil. A series of oedometer tests were carried out on undisturbed and remoulded loess samples prepared at various moisture contents. The effects of moisture content on the structured yield stress, the preconsolidation pressure, and the structural strength were also captured. It was found that the influence of the structured property of loess on the compression behaviour is divergent between undisturbed and remoulded loess samples. The discrepancy before and after structural yielding is more remarkable for the undisturbed soil. The Casagrande method realized through the MATLAB program can effectively eliminate human factors and accurately calculate the corresponding preconsolidation pressure for undisturbed soil. The effects of moisture content on the method for determining the preconsolidation pressure considering the structured property of loess were discussed. The determination method can accurately evaluate the loess consolidation state in loess regions. The influencing rules which the moisture content exerts on the structured yield stress, the preconsolidation pressure, and the structural strength all conform to exponential functions. The study is of great significance to correctly differentiating the foundation consolidation states and calculating the ground settlement in loess regions.
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Chen, B. SY, et P. W. Mayne. « Statistical relationships between piezocone measurements and stress history of clays ». Canadian Geotechnical Journal 33, no 3 (2 juillet 1996) : 488–98. http://dx.doi.org/10.1139/t96-070.

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A database containing piezocone soundings from 205 clay sites around the world has been compiled for the calibration of an analytical cone penetration model and the development of statistical correlations. Yield stresses from laboratory oedometer tests were used as reference values for determining the stress history of natural clay deposits. Both simple and multiple regression analyses were performed on these data to evaluate correlative trends. Several simplified empirical relationships were identified for use in practice with the most reliable in relating preconsolidation stress to net cone tip resistance. Key words: cone tip resistance, overconsolidation ratio (OCR), preconsolidation pressure, piezocone, statistical relationships, stress history.
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Yoon, Hyung-Koo, Changho Lee, Hyun-Ki Kim et Jong-Sub Lee. « Evaluation of preconsolidation stress by shear wave velocity ». Smart Structures and Systems 7, no 4 (25 avril 2011) : 275–87. http://dx.doi.org/10.12989/sss.2011.7.4.275.

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Boone, Storer J. « A critical reappraisal of “preconsolidation pressure” interpretations using the oedometer test ». Canadian Geotechnical Journal 47, no 3 (mars 2010) : 281–96. http://dx.doi.org/10.1139/t09-093.

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Over the past 70 years, a number of methods have been proposed for the interpretation of the characteristic vertical effective yield stress, or “preconsolidation pressure,” of compressible soils as defined using the standard oedometer test. The concept of the “preconsolidation pressure” has been extraordinarily useful in geotechnical engineering for analysing and predicting settlement behaviour and for normalizing other engineering parameters for comparative purposes. Defining this characteristic stress, however, is often problematic and relies heavily on graphical techniques that are subject to some uncertainty, particularly when using semi-log plots for this purpose. This paper illustrates fundamental difficulties with the interpretation of oedometer test and presents an alternative technique for defining unambiguous values of the vertical effective yield stress.
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Sauer, E. Karl, et E. A. Christiansen. « Preconsolidation pressures in intertill glaciolacustrine clay near Blaine Lake, Saskatchewan ». Canadian Geotechnical Journal 25, no 4 (1 novembre 1988) : 831–39. http://dx.doi.org/10.1139/t88-091.

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Soft, intertill, glaciolacustrine clays are of concern for stability of slopes and foundations. An intertill clay deposit between 32 and 54 m below the surface was continuously cored. Index properties were determined for 46 samples and 10 samples were tested on the oedometer. Stratigraphic evidence indicates that the glaciolacustrine clay (Blaine Lake Member), lying between the till of the Sutherland and Saskatoon groups, was glaciated three times. However, preconsolidation pressures of this intertill clay show the degree of consolidation is less than 20% based on a total stress from an estimated ice thickness extrapolated from the Cypress Hills. This low preconsolidation pressure suggests there was insufficient time for dissipation of excess pore-water pressure created by thickening of the advancing glacier. Key words: preconsolidation pressure, excess pore-water pressure, glaciers, intertill clay.
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Tavares, Uilka Elisa, Mário Monteiro Rolim, Veronildo Souza de Oliveira, Elvira Maria Regis Pedrosa, Glécio Machado Siqueira et Adriana Guedes Magalhães. « Spatial Dependence of Physical Attributes and Mechanical Properties of Ultisol in a Sugarcane Field ». Scientific World Journal 2015 (2015) : 1–10. http://dx.doi.org/10.1155/2015/531231.

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This study investigates the effect of conventional tillage and application of the monoculture of sugar cane on soil health. Variables like density, moisture, texture, consistency limits, and preconsolidation stress were taken as indicators of soil quality. The measurements were made at a 120 × 120 m field cropped with sugar cane under conventional tillage. The objective of this work was to characterize the soil and to study the spatial dependence of the physical and mechanical attributes. Then, undisturbed soil samples were collected to measure bulk density, moisture content and preconsolidation stress and disturbed soil samples for classification of soil texture, and consistency limits. The soil texture indicated that soil can be characterized as sandy clay soil and a sandy clay loam soil, and the consistency limits indicated that the soil presents an inorganic low plasticity clay. The preconsolidation tests tillage in soil moisture content around 19% should be avoided or should be chosen a management of soil with lighter vehicles in this moisture content, to avoid risk of compaction. Using geostatistical techniques mapping was possible to identify areas of greatest conservation soil and greater disturbance of the ground.
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Yin, Jian-Hua, et James Graham. « Equivalent times and one-dimensional elastic viscoplastic modelling of time-dependent stress–strain behaviour of clays ». Canadian Geotechnical Journal 31, no 1 (1 février 1994) : 42–52. http://dx.doi.org/10.1139/t94-005.

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This paper describes the recent concept of equivalent time and how it can be used in a revised version of an earlier elastic viscoplastic model for one-dimensional straining of clays. It clarifies how parameters in the model can be determined using data from single-stage or multistage creep tests. The model can describe one-dimensional stress or strain responses under general conditions that include multistage loading with creep straining, continuous loading, and unloading or reloading. It also describes modelling for constant rate of straining tests, constant rate of stressing tests, and relaxation tests. Preconsolidation pressures are shown to depend on unloading–reloading, aging, and other loading processes. Key words : clay, compression, creep, equivalent time, elastic viscoplastic, preconsolidation pressure.
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Thèses sur le sujet "Preconsolidation stress"

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Giusti, Ilaria. « Improvement of piezocone test interpretation for partial drainage conditions and for transitional soils ». Doctoral thesis, 2017. http://hdl.handle.net/2158/1138812.

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The present study shows the results of experimental analyses of field cone penetration tests as well as calibration chamber mini-piezocone tests on soils of intermediate permeability (silts, clayey and sandy silts). The penetration rate varied across over three orders of magnitude to provide information on partially drained and undrained tip resistance, excess pore water pressure and friction sleeve. Whilst previous experimental researches essentially focused on tip resistance and pore water pressure measurements, it is worthwhile underlying that the present study is one of the first experimental studies that explored the effect of penetration rate on sleeve friction measurements. As the penetration rate is reduced, moving from the undrained conditions to the fully drained conditions, friction sleeve systematically decreases, together with the expected results in terms of increasing tip resistance and decreasing excess porewater pressure. The obtained experimental database of penetration measurements on intermediate soils can be added to the previous worldwide collected data to develop a new general interpretation procedure for cone tests in transitional soils. Besides, numerical analyses have been carried out by using the Finite Element Method. The Updated Lagrangian technique has been adopted to simulate the large strain penetration process. Both the Modified Cam Clay constitutive model and the Mohr Coulomb model have been used to compare numerical simulation results with, respectively, the experimental results on kaolin clay (Randolph and Hope, 2004; Schneider et al., 2007) and those obtained with the present study. The problem of piezocone miss-interpretation in case of transitional soils, such as loose silt mixture has been dealt with an empirical methodology, based on the calibration of the Soil Behaviour Type index using soil characteristics inferred from reference boreholes. Moreover, a new approach has been proposed to overcome miss-interpretation of piezocone test results for soil layers belonging to vadose zones in which the effective stress state is controlled by suction. This procedure allows for the correction of the Soil Behaviour Type (SBT) index, in order to allocate correctly the investigated soils inside SBT classification charts (Robertson, 1990). In addition to that, the applied method has suggested a procedure, based on piezocone measurements, to estimate the effective stress state in the case of a homogeneous soil layer in which a vadose zone above the water table is present.
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Chapitres de livres sur le sujet "Preconsolidation stress"

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Kootahi, Karim, et Paul W. Mayne. « A Two-Fold Empirical Approach for Estimating the Preconsolidation Stress in Clay Deposits ». Dans Proceedings of GeoShanghai 2018 International Conference : Multi-physics Processes in Soil Mechanics and Advances in Geotechnical Testing, 391–99. Singapore : Springer Singapore, 2018. http://dx.doi.org/10.1007/978-981-13-0095-0_44.

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Actes de conférences sur le sujet "Preconsolidation stress"

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Samarakoon, Radhavi A., et John S. McCartney. « Effect of Drained Heating and Cooling on the Preconsolidation Stress of Saturated Normally Consolidated Clays ». Dans Geo-Congress 2020. Reston, VA : American Society of Civil Engineers, 2020. http://dx.doi.org/10.1061/9780784482780.061.

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DeGroot, Don J., Melissa M. Landon et Robert M. Ryan. « Objective Evaluation of Preconsolidation Stress for Soft Clays from Constant Rate of Strain Pore Pressure Data ». Dans Geo-Denver 2007. Reston, VA : American Society of Civil Engineers, 2007. http://dx.doi.org/10.1061/40917(236)4.

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Long, Xiaoyan, Greg Tucker, Paul Gibbs, Zack Westgate, Alberto Troya Diaz et Asitha Senanayake. « Soil Classification and Evaluation of Preconsolidation Stress of Atlantic Outer Continental Shelf OCS Sediments from Oedometer and Cone Penetration Testing ». Dans Offshore Technology Conference. Offshore Technology Conference, 2019. http://dx.doi.org/10.4043/29541-ms.

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