文献类型：期刊文献

英文题名：Experiment and Peridynamics Simulation on Failure Mechanical Behavior of Cylindrical Sandstone Containing Two Persisting Fissures Under Conventional Triaxial Compression

作者：Yang, Sheng-Qi[1,2];Li, Heng[2];Du, Shi-Gui[3];Yong, Rui[3];Wang, Su-Sheng[1];Tian, Wen-Ling[2];Hu, Yun-Jin[1];Niu, Yong[1]

机构：[1]Shaoxing Univ, Sch Civil Engn, Key Lab Rock Mech & Geohazards, Shaoxing 312000, Zhejiang, Peoples R China;[2]China Univ Min & Technol, Sch Mech & Civil Engn, State Key Lab Intelligent Construct & Hlth Operat, Xuzhou 221116, Peoples R China;[3]Ningbo Univ, Inst Rock Mech, Ningbo 315211, Peoples R China

年份：2024

外文期刊名：ROCK MECHANICS AND ROCK ENGINEERING

收录：SCI-EXPANDED(收录号：WOS:001374565300001)、、EI(收录号：20245117542265)、Scopus(收录号：2-s2.0-105001076512)、WOS

基金：The authors would 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：Fissured sandstone; Three-dimensional bond-based peridynamics; Triaxial compressive strength; Three-dimensional failure mode; Three-dimensional crack evolution

外文摘要：In underground engineering, fractured rock masses, which exist in complex surrounding rock environments, are often the key focus of research as weak planes. To analyze the effect of confining pressure and the geometry of fractures on the failure mechanical behavior of rock, it is very important to conduct a series of experimental and numerical investigation at the macro- and meso-levels. In this research, the conventional triaxial compression tests on double-fissured sandstone specimens with different fissure dip angles were first carried out. Based on the experimental results, the three-dimensional bond-based peridynamics (BB-PD) numerical simulation was further explored. The research results show that under conventional triaxial compression conditions, intact sandstone exhibited brittle failure, while fissured sandstone undergoes a brittle-to-ductile transition in deformation behavior influenced by the fissure inclination angle, with the transition occurring at a fissure inclination angle of 45 degrees. The triaxial compressive strength (TCS) of fissured sandstone is controlled by confining pressure and fissure inclination angle. TCS linearly increases with increasing confining pressure, following Mohr-Coulomb strength criterion, while TCS non-linearly increases with increasing fissure inclination angle. The elastic modulus and Poisson's ratio of fissured sandstone increase with increasing fissure inclination angle. However, under conventional triaxial compression, fissured sandstone exhibits three typical failure modes: tensile failure, mixed failure, and shear failure. These modes can be further categorized into seven specific models based on crack propagation patterns. With increasing fissure inclination angle, the main controlling factor of mechanical and damage characteristics of prefabricated fissured sandstone gradually shifts from the fissure inclination angle to the confining pressure. Among them, fissured sandstone for Types B-D is controlled by the fissure inclination angle, fissured sandstone for Type E is jointly controlled by the fissure inclination angle and confining pressure, and fissured sandstone for Type F is mainly controlled by the confining pressure. The research findings provided new insights and methods for studying the crack evolution mechanism and failure characteristics of deep fractured rock mass.