文献类型：期刊文献

英文题名：An anisotropic elastoplastic strong discontinuity model for shear failure in anisotropic rock masses

作者：Li, Yonghui Tang, Hongxiang Zhu, Feng Hu, Zhiqiang

第一作者：李永辉;Li, Yonghui

通信作者：Tang, HX[1]

机构：[1]Guizhou Inst Technol, Sch Civil Engn, Guiyang 550001, Peoples R China;[2]Dalian Univ Technol, State Key Lab Coastal & Offshore Engn, Dalian 116023, Peoples R China

第一机构：贵州理工学院土木工程学院

通信机构：corresponding author), Dalian Univ Technol, State Key Lab Coastal & Offshore Engn, Dalian 116023, Peoples R China.

年份：2024

卷号：176

外文期刊名：COMPUTERS AND GEOTECHNICS

收录：;EI(收录号：20243917096325);Scopus(收录号：2-s2.0-85204648705);WOS:【SCI-EXPANDED(收录号:WOS:001324335500001)】；

基金：The authors are pleased to acknowledge the support of this work by the National Natural Science Foundation of China through contract/grant numbers 51979025, 52011530189, and the Fundamental Research Funds for the Central Universities through contract/grant numbers DUT21TD106.

语种：英文

外文关键词：Anisotropy; Elastoplastic; Strong discontinuity approach; Strain localization; Rock masses; Ill-posedness

摘要：In this paper, we propose a noval anisotropic elastoplastic strong discontinuity-FEM (SD-FEM) for analyzing the complete progressive shear failure process in anisotropic rock masses. The deformation property preceding slip is described with an elastoplastic formulation incorporating the microstructure tensor approach. Anisotropic discontinuous bifurcation analysis is conducted to judge the initiation conditions and propagation direction of slip lines. Furthermore, a derived anisotropic stress-displacement relation on the discontinuity is utilized to describe the post-failure response asscociated with slip. Two numerical examples, namely the uniaxial compression test of anisotropic rock masses and the loading problem of the anisotropic rock slope, are used to demonstrate the remarkable capabilities of the anisotropic elastoplastic SD-FEM model. It is illustrated that this model can not only reflect the anisotropic mechanical characteristics of rock masses but also accurately simulate the complete progressive failure process, spanning from uniform deformation to sliding failure. Notably, it is observed that the magnitude of slip (i.e., discontinuous displacement) exhibits a linear increase with the vertical load, highlighting the elastic-brittle deformation characteristics of rock masses. Moreover, the eigenvalues of the global stiffness matrix remain positive even in the softening stage, which enables the numerical calculation to proceed and ensures the mesh-independent numerical solutions, indicating that the anisotropic SD-FEM can regularize the ill-posedness of the boundary value problem when strain softening occurs.