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Imperfection sensitivity of shear banding in gradient-dependent Cam-clay plasticity model

Stankiewicz A.

Computer Assisted Methods in Engineering and Science

2015

Vol. 22, no. 2

115--139

The paper deals with the numerical simulation of strain localization in granular two-phase material. A gradient enhancement of modified Cam-clay model is introduced to overcome the problem of spurious discretization sensitivity of finite element solution. Two- and three-field finite elements implemented in the finite element analysis program (FEAP) are used in numerical simulations. The attention is focused on imperfection sensitivity of shear banding simulations. An application of the modelling framework to the slope stability problem is also included.

Numerical simulation of instabilities in one- and two-phase soil model based on CAM-CLAY plasticity

Pamin J., Stankiewicz A.

Czasopismo Techniczne. Środowisko

2008

R. 105, z. 3-Ś

81-91

In the paper a two-phase gradient-dependent soil model which is an extension of the Modified Cam-Clay plasticity concept has been derived. A three field finite element with the discretization of displacements, plastic multiplier and excess pore pressure has been proposed for the analysis of instabilities in the consolidation problem of evolving deformations and pore pressures. A set of computations for the biaxial compression test have been performed.

W artykule przedstawiono gradientowy model gruntu będący rozszerzeniem zmodyfikowanego modelu Cam-Clay dla ośrodka dwufazowego. Do opisu problemu konsolidacji i ewolucji odkształceń i ciśnień porowych użyto trójpolowego elementu skończonego, z aproksymacją pola przemieszczeń, mnożnika plastycznego i nadwyżki ciśnień porowych. Przedstawiono wyniki obliczeń dla testu dwuosiowego ściskania.

Finite element analysis of fluid influence on instabilities in two-phase Cam-clay plasticity model

Stankiewicz A., Pamin J.

Computer Assisted Mechanics and Engineering Sciences

2006

Vol. 13, No. 4

669-682

The influence of fluid phase on soil instabilities is investigated using the modified Cam-clay model within a two-phase description. Spurious mesh dependence of finite element results is prevented by a gradient enhancement of the model. The results of numerical tests for one-phase and two-phase model are compared. The influence of permeability on the stabilizing role of the fluid phase is assessed.