Upper bound to bearing capacity of layered soils

Florkiewicz, Antoni

doi:10.1139/t89-084

Cited by 58 publications

(25 citation statements)

References 9 publications

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“…These methods may be performed either analytically or experimentally. The analytical methods involve slip line (Florkiewicz 1989), limit equilibrium (Dewaikar and Mohapatra 2003), limit analysis (Michalowski and Shi 1995), and numerical approaches (Burd and Frydman 1997). Experimental work involves laboratory (Schanz and Vermeer 1996), full scale in-situ (Gibbens and Briaud 1994), and centrifuge (Okamura et al 2002) tests.…”

Section: Introductionmentioning

confidence: 99%

A Simple Limit Equilibrium Approach for Calculation of Ultimate Bearing Capacity of Shallow Foundations on Two-Layered Granular Soils

Ghazavi

Eghbali

2008

Geotech Geol Eng

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The bearing capacity of shallow foundations in a non-homogeneous soil profile has been a challenging task in geotechnical engineering. In this paper, a limit equilibrium method is used for calculating bearing capacity factors of shallow foundations constructed on a two-layered granular soil profile. The main objective has been to determine the ultimate bearing capacity computed from equivalent bearing capacity factors N q and N c and comparing that with numerical analysis using finite element methods. It will be shown that the data obtained form the developed method are well comparable with those obtained from FE approach, specially when the difference between shear strength parameters of layers is low which is a practical case for sedimentary soil profiles and also for artificially compacted soils. A computer program has been developed to investigate the influence of various parameters on bearing capacity factors.

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Section: Introductionmentioning

confidence: 99%

A Simple Limit Equilibrium Approach for Calculation of Ultimate Bearing Capacity of Shallow Foundations on Two-Layered Granular Soils

Ghazavi

Eghbali

2008

Geotech Geol Eng

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“…With the advent of powerful computers and the development of modern computational methods the ability to analyze problems has, for the first time, outstripped our ability to describe the material (Drucker, 1991 (Chen and Davidson, 1973;Florkiewicz, 1989;Michalowski, 1997;Ukritchon et al, 1998, Kumar andKouzer, 2007;Kumar and Kouzer, 2008a;Kumar and Khatri, 2011) lateral earth pressure problems (Chen and Rosenfarb, 1973), stability of slopes (Chen and Giger, 1971;Izbicki, 1981), and vertical cuts (Drescher, 1983;Su et al, 1998;Kumar and Kouzer, 2008b). The theory provides upper and lower bounds that serve to bracket the limit load for rigid-perfectly plastic materials, and computations of the two bounds is generally referred to as limit analysis (Chen, 1975).…”

Section: Methods Of Analysismentioning

confidence: 99%

Soluciones de forma cerrada para la capacidad de carga de zapatas en suelos anisotrópicos cohesivos

Al‐Shamrani

Moghal

2015

Rev. ing. constr.

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“…Although the limit analysis method is a relatively new technique, compared with the slip-line and limit equilibrium methods, it has been found to have wide applications for solutions of conventional geotechnical stability problems, including bearing capacity of footings (Chen and Davidson, 1973;Florkiewicz, 1989;Michalowski, 1997;Ukritchon et al, 1998;Kumar and Kouzer, 2007;Kumar and Kouzer, 2008a;Kumar and Khatri, 2011), lateral earth pressure problems (Chen and Rosenfarb, 1973), stability of slopes (Chen and Giger 1971;Izbicki, 1981), and vertical cuts (Drescher, 1983;Su et al, 1998;Kumar and Kouzer, 2008b). The theory provides upper and lower theorems that serve to bracket the limit load for rigid-perfectly plastic materials, and computations of the two bounds is generally referred to as limit analysis (Chen, 1975).…”

Section: Methods Of Analysismentioning

confidence: 99%

Upper Bound Solutions for Bearing Capacity of Footings on Anisotropic Cohesive Soils

Al‐Shamrani¹,

Moghal²

2012

GeoCongress 2012

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A closed form solution for the undrained bearing capacity of strip footings on anisotropic cohesive soils using kinematic approach of limit analysis has been presented in this article. A translational failure mechanism with variable wedge angles is attempted and the resulting upper bound was analytically determined leading to an analytical expression for the bearing capacity factor. The influence of degree of soil anisotropy on the corresponding value for the bearing capacity factor was evaluated and the results are compared with available pertinent solution. An advantage of the closed-form solution is that it is more convenient for complex computations as well as it clearly depicts the effect of soil anisotropy on the bearing capacity as opposed to tabular or graphical representations where such an effect is obstructed in a number of charts and/or tables.. INTRODUCTIONThe ultimate bearing capacity of foundations is commonly estimated based on the assumption that the soil is isotropic with respect to shear strength. However, clay strata are usually deposited and consolidated under one-dimensional conditions, and hence most naturally occurring clays are inherently anisotropic (Ward et al., 1965;Bishop 1966). This commonly results in horizontal bedding planes having strength and other physical properties different in horizontal and vertical directions. Because of soil anisotropy, the undrained shear strength varies with the orientation of the failure plane. In the bearing capacity problem, the direction of the principal stresses along any assumed failure surface changes from one point to the other. Therefore, it is more realistic to use values of strength appropriate to each orientation of the failure plane. This is of a prime importance especially for the case of analytical solutions where the undrained bearing capacity is solely function of one soil parameter (i.e. undrained shear strength), contrary to computational solutions where the soil behavior is characterized by several constitutive parameters, albeit with different level of importance.There have been several attempts pertaining to the evaluation of the bearing capacity of footings on cohesive soils that took into account anisotropy in shear strength. Using the limit equilibrium approach and assuming a circular failure 1066 GeoCongress 2012

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Upper bound to bearing capacity of layered soils

Cited by 58 publications

References 9 publications

A Simple Limit Equilibrium Approach for Calculation of Ultimate Bearing Capacity of Shallow Foundations on Two-Layered Granular Soils

A Simple Limit Equilibrium Approach for Calculation of Ultimate Bearing Capacity of Shallow Foundations on Two-Layered Granular Soils

Soluciones de forma cerrada para la capacidad de carga de zapatas en suelos anisotrópicos cohesivos

Upper Bound Solutions for Bearing Capacity of Footings on Anisotropic Cohesive Soils

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