Strain localization of Mohr-Coulomb soils with non-associated plasticity based on micropolar continuum theory  

作　　者：Jianbin Tang Xi Chen Liusheng Cui Zongqi Liu 

机构地区：[1]Key Laboratory of Urban Underground Engineering of Ministry of Education,Beijing Jiaotong University,Beijing,100044,China

出　　处：《Journal of Rock Mechanics and Geotechnical Engineering》2023年第12期3316-3327,共12页岩石力学与岩土工程学报（英文版）

基　　金：support from National Natural Science Foundation of China(Grant No.52178309);the National Key R&D Program of China(Grant No.2017YFC0804602);the Fundamental Research Funds for the Central Universities(Grant No.2019JBM092)。

摘　　要：To address the problems of strain localization, the exact Mohr-Coulomb (MC) model is used based on second-order cone programming (mpcFEM-SOCP) in the framework of micropolar continuum finite element method. Using the uniaxial compression test, we focused on the earth pressure problem of rigid wall segment involving non-associated plasticity. The numerical results reveal that when mpcFEM-SOCP is applied, the problems of mesh dependency can be effectively addressed. For geotechnical strain localization analysis involving non-associated MC plasticity, mpcFEM-SOCP in conjunction with the pseudo-time discrete scheme can improve the numerical stability and avoid the unreasonable softening issue in the pressure-displacement curves, which may be encountered in the conventional FEM. It also shows that the pressure-displacement responses calculated by mpcFEM-SOCP with the pseudo-time discrete scheme are higher than those calculated by mpcFEM-SOCP with the Davis scheme. The inclination angle of shear band predicted by mpcFEM-SOCP with the pseudo-time discrete scheme agrees well with the theoretical solution of non-associated MC plasticity.

关 键 词：Strain localization Micropolar continuum Mohr-Coulomb(MC)model Non-associated plasticity Second-order cone programming 

分 类 号：X53[环境科学与工程—环境工程]