Modeling footing resting on anisotropic sand using material point method  

作　　者：Liu Gao Dong Liao Pin-Qiang Mo 

机构地区：[1]School of Mechanics and Civil Engineering,China University of Mining and Technology,Xuzhou,221116,China [2]School of Civil and Hydraulic Engineering,Huazhong University of Science and Technology,Wuhan,430074,China

出　　处：《Journal of Rock Mechanics and Geotechnical Engineering》2023年第12期3271-3290,共20页岩石力学与岩土工程学报（英文版）

基　　金：supported by the National Natural Science Foundation of China(Grant No.52108359).

摘　　要：Sand typically exhibits anisotropic internal structure which may significantly influence its mechanical behavior. The material point method (MPM) can eliminate mesh distortion and thus is suitable for investigating geotechnical problems with large deformation. In this study, an advanced anisotropic critical state theory (ACST)-based soil model is implemented in MPM to study the response of strip footing resting on anisotropic sand. The capability of the model is verified by simulating several element tests and strip footing tests with different soil densities and fabric bedding plane orientations. For the footing problem with a vertical load, as the fabric bedding plane orientation increases, the bearing capacity decreases and its corresponding settlement increases. The failure pattern becomes asymmetrical when the bedding plane orientation or the loading direction is inclined. A comparison between the simulation results predicted by the anisotropic and isotropic models is made, which demonstrates that neglecting the fabric anisotropy may lead to the overestimation of the bearing capacity.

关 键 词：Material point method(MPM) FOOTING Constitutive model ANISOTROPY Inclined loading 

分 类 号：TU43[建筑科学—岩土工程]