The at-rest earth pressure coefficient prediction using simple elasto-plastic constitutive models

Federico, Antonio; Elia, Gaetano; Murianni, Agnese

doi:10.1016/j.compgeo.2008.01.006

Cited by 22 publications

(12 citation statements)

References 16 publications

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“…Nevertheless, the isotropic version of E‐SCLAY1 has been presented to show its similar capabilities to other previous studies (e.g. ), but even initially remoulded soils show some fabric under one dimensional compression (e.g. ), the authors believe that trying to fit K 0NC values with isotropic plastic potential surfaces is not realistic.…”

Section: Model Featuresmentioning

confidence: 54%

“…Federico et al ) have used plastic potential surfaces with higher degrees of freedom to fit the desired K 0NC value. Federico et al also present a wide analysis of the analytical expressions that give K 0NC for isotropic critical state models. The analytical expression that gives the value of K 0NC for E‐SCLAY1S is derived in Appendix B.…”

Section: Model Featuresmentioning

confidence: 99%

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An anisotropic elastoplastic model for soft clays based on logarithmic contractancy

Sivasithamparam

Castro

2015

Num Anal Meth Geomechanics

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SUMMARYA new constitutive model for soft structured clays is developed based on an existing model called S-CLAY1S, which is a Cam clay type model that accounts for anisotropy and destructuration. The new model (E-SCLAY1S) uses the framework of logarithmic contractancy to introduce a new parameter that controls the shape of the yield surface as well as the plastic potential (as an assumed associated flow rule is applied). This new parameter can be used to fit the coefficient of earth pressure at rest, the undrained shear strength or the stiffness under shearing stress paths predicted by the model. The improvement to previous constitutive models that account for soil fabric and bonding is formulated within the contractancy framework such that the model predicts the uniqueness of the critical state line and its slope is independent of the contractancy parameter. Good agreement has been found between the model predictions and published laboratory results for triaxial compression tests. An important finding is that the contractancy parameter, and consequently the shape of the yield surface, seems to change with the degree of anisotropy; however, further study is required to investigate this response. From published data, the yield surface for isotropically consolidated clays seems 'bullet' or 'almond' shaped, similar to that of the Cam clay model; while for anisotropically consolidated clays, the yield surface is more elliptical, like a rotated and distorted modified Cam clay yield surface.

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Section: Model Featuresmentioning

confidence: 54%

Section: Model Featuresmentioning

confidence: 99%

An anisotropic elastoplastic model for soft clays based on logarithmic contractancy

Sivasithamparam

Castro

2015

Num Anal Meth Geomechanics

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“…In odometric conditions, the increment of the gravity loading, due to the propagation of the wetting front above the reference element, forces the response in the ( p ′ , q ) plane to still move along the K 0 line (path AB ). In this branch, the stress ratio remains almost constant as the variations of the saturation degree are too small for significantly affecting the size of the Cam‐Clay ellipse; see . This means that, going from A to B , the yield surface expands following the plastic volumetric strain increments and therefore, the response of the material, in the compressibility plane, is controlled by the NCL relative to the current saturation degree.…”

Section: Numerical Resultsmentioning

confidence: 99%

“…The pore‐water pressure profile is assumed hydrostatic, and the groundwater table is initially located at the lower boundary. The effective horizontal stresses

σ_{h}^{'}

are expressed as a function of

σ_{v}^{'}

through the earth pressure coefficient K 0 ; see .…”

Section: Numerical Modeling Of Water Imbibitionmentioning

confidence: 99%

Hydro-mechanical response of collapsible soils under different infiltration events

Rotisciani

Sciarra

Casini

et al. 2015

Int. J. Numer. Anal. Meth. Geomech.

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The behavior of a partially saturated soil during surface-water infiltration is analyzed by means of an elasto-plastic constitutive model formulated in terms of effective stress and extended to unsaturated conditions. The model is calibrated considering laboratory-scale experimental results under suction-controlled conditions. The wetting process in two collapsing soils, initially loaded at in situ stresses, is simulated by imposing two different boundary conditions: surface ponding and water flow. The stress paths resulting from the imbibition process are analyzed at different points inside the laye

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“…The porewater pressure profile is assumed hydrostatic and the groundwater table is located initially at the lower boundary. The effective horizontal stresses are expressed as a function of σ v through the earth pressure coefficient K 0 , see Federico et al (2009).…”

Section: Numerical Resultsmentioning

confidence: 99%

Modeling rainfall infiltration through coarse and fine-grained unsaturated geomaterials

Rotisciani¹,

Desideri²,

Sciarra³

et al. 2014

Unsaturated Soils: Research &Amp; Applications

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In this paper we study an imbibition test problem defined over a real two-dimensional soil domain subject to in-situ stresses and oedometric boundary conditions. Two different kinds of materials are tested, which are characterized by different pore-structures and hydro-mechanical properties. The aim is that of clarifying the behavior of real materials under real loading conditionss. The stress paths associated to rainfall infiltration processes are simulated by using the commercial code ABAQUS, endowed with an own-made subroutine developed in order to incorporate the effects of partial saturation into the tangent stiffness.

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The at-rest earth pressure coefficient prediction using simple elasto-plastic constitutive models

Cited by 22 publications

References 16 publications

An anisotropic elastoplastic model for soft clays based on logarithmic contractancy

An anisotropic elastoplastic model for soft clays based on logarithmic contractancy

Hydro-mechanical response of collapsible soils under different infiltration events

Modeling rainfall infiltration through coarse and fine-grained unsaturated geomaterials

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