文献类型：期刊文献

英文题名：Three-dimensional discrete element simulation of the triaxial cyclic loading of sandstone based on a nonlinear parallel-bonded stress corrosion model

作者：Cao, Ming-Hui[1];Yang, Sheng-Qi[1,2];Tian, Wen-Ling[1];Huang, Yan-Hua[1];Huang, Man[2]

机构：[1]China Univ Min & Technol, Sch Mech & Civil Engn, State Key Lab Intelligent Construct & Hlth Operat, Xuzhou 221116, Peoples R China;[2]Shaoxing Univ, Sch Civil Engn, Key Lab Rock Mech & Geohazards Zhejiang Prov, Shaoxing 312000, Peoples R China

年份：2024

卷号：168

外文期刊名：COMPUTERS AND GEOTECHNICS

收录：SCI-EXPANDED(收录号：WOS:001187874500001)、、EI(收录号：20240815608950)、Scopus(收录号：2-s2.0-85185395426)、WOS

基金：This research was supported by the National Natural Science Foundation of China (42077231) and the National Key Research and Development Program of China (2022YFC2905700) . The authors would also like to express their sincere gratitude to the editor and anonymous reviewers for their valuable comments, which have greatly improved this paper.

语种：英文

外文关键词：Cyclic loading; Damage evolution; Crack propagation; Energy density; Bonded-particle model; Discrete element simulation

外文摘要：To reproduce the nonlinear damage of sandstone under cyclic loading, a nonlinear parallel-bonded stress corrosion (N-PSC) model is developed based on the linear parallel bond (LPB) model in particle flow code (PFC). The damage caused by cyclic loading is simulated by nonlinearly changing the bond diameter according to the nonlinear changes in the axial plastic strain of sandstone. The results show that the N-PSC model can effectively reproduce the main mechanical characteristics observed in laboratory tests, including the stress-strain curve, peak strength, axial plastic deformation, elastic modulus, and energy evolution characteristics. The sandstone specimens are damaged slowly during the elastic cyclic loading stage and rapidly after the plastic stage. In the first stage of post-peak cycling, the number of cracks inside the specimen increases dramatically as microcracks expand, coalesce, and form macroscopic fracture zones, resulting in a sharp release of energy. The specimens exhibit shear fracture under triaxial cyclic loading. However, in addition to the main shear fracture, tensile cracks are visible at the top and bottom of the specimen, which are caused by stress concentration extrusion. The N-PSC model is a powerful tool for investigating the evolution of rock damage under cyclic loading.