An assumed enhanced strain finite element framework for tensile fracturing processes with dual-mechanism failure in transversely isotropic rocks  

作　　者：Yang Zhao Rui Wang Jian-Min Zhang 

机构地区：[1]State Key Laboratory of Hydroscience and Engineering,Department of Hydraulic Engineering,Tsinghua University,Beijing,100084,China

出　　处：《Journal of Rock Mechanics and Geotechnical Engineering》2025年第3期1474-1488,共15页岩石力学与岩土工程学报(英文)

基　　金：supported by the National Natural Science Foundation of China(Grant Nos.52038005 and 52201326);the fellowship of China Postdoctoral Science Foundation(Grant No.2022M721883);Tsinghua University Initiative Scientific Research Program.

摘　　要：We present an assumed enhanced strain finite element framework for the simulation of tensile fracturing processes in transversely isotropic rocks.Fractures along the weak bedding planes and through the anisotropic rock matrix are treated with distinct enrichment,and a recently proposed dualmechanism tensile failure criterion for transversely isotropic rocks is adopted to determine crack initiation for the two failure modes.The cohesive crack model is adopted to characterize the response of embedded cracks.As for the numerical implementation of the proposed framework,both algorithms for the update of local history variables at Gauss points and of the global finite element system are derived.Four boundary-value problem simulations are carried out with the proposed framework,including uniaxial tension tests of Argillite,pre-notched square loaded in tension,three-point bending tests on Longmaxi shale,and simulations of tensile cracks induced by a strip load around a tunnel in transversely isotropic rocks.Simulation results reveal that the proposed framework can properly capture the tensile strength anisotropy and the anisotropic evolution of tensile cracks in transversely isotropic rocks.

关 键 词：Tensile fracture Assumed enhanced strain finite element Three-point bending test transversely isotropic rock Tensile failure criterion 

分 类 号：TG1[金属学及工艺—金属学]