文献类型：期刊文献

英文题名：Mechanical behavior, energy evolution and damage mechanism of anisotropic shale under triaxial multilevel cyclic loading: an experimental investigation

作者：Li, Ke-Sheng[1];Yang, Sheng-Qi[2,3];Liu, Chuan-Xiao[4];Song, Yu[1];Wang, Su-Sheng[2]

机构：[1]China Univ Min & Technol, State Key Lab Intelligent Construct & Hlth Operat, Xuzhou 221116, Jiangsu, Peoples R China;[2]Shaoxing Univ, Key Lab Rock Mech & Geohazards Zhejiang ProvinceSc, Shaoxing 312000, Peoples R China;[3]China Univ Min & Technol, Sch Mech & Civil Engn, Xuzhou 221116, Peoples R China;[4]Shandong Agr Univ, Coll Water Conservancy & Civil Engn, Tai An 271018, Shandong, Peoples R China

年份：2024

卷号：24

期号：4

外文期刊名：ARCHIVES OF CIVIL AND MECHANICAL ENGINEERING

收录：SCI-EXPANDED(收录号：WOS:001281569800002)、、EI(收录号：20244317246638)、Scopus(收录号：2-s2.0-85206850338)、WOS

基金：This work was funded by the National Natural Science Foundation of China (42077231; 51574156). We also would like to express our sincere gratitude to the editor and two anonymous reviewers for their valuable comments, which have greatly improved this paper.DAS:All data that support the findings of this study are available from the corresponding author upon reasonable request.

语种：英文

外文关键词：Anisotropic shale; Multilevel cyclic loading; Mechanical behavior; Energy evolution; Microscopic characteristics

外文摘要：This paper aims to investigate the fatigue response of layered shale under triaxial cyclic loading. In our experiments, multilevel constant-amplitude cyclic loading was conducted under 5 MPa confining pressure. The anisotropic mechanical behaviors and energy evolution of shale specimens were analyzed for different bedding plane angles, in addition, the damage mechanism was discussion by observing microstructure of the fracture surface. Results indicated that the fatigue parameters, energy dissipation and damping characteristics were influenced by interbed structure. Increased bedding angle from 0 degrees to 90 degrees, strength, lifetime, axial strain and deformation modulus first decreased and subsequently increased, and the 60 degrees interbedding orientation was the turning point for above parameters to change. As the stress level increased, the strain, elastic modulus, energy and damping ratio of the specimen showed step-like rise. The sudden jump in axial stress caused much more damage than those from fatigue loading. Macroscopic failure mode analysis revealed, with increasing bedding angle, the specimen showed a changeover from local shear failure to overall shear failure to severe splitting failure. Microscopic cracks at the fracture surface of specimen after cyclic loading was dominated by intergranular fracture, and the severity of macroscopic failure was positively dependent on the proportion of intragranular fracture and transgranular fracture.