文献类型：期刊文献

英文题名：Anisotropic Mechanical Behavior of Stratified Sandstone Subjected to Cyclic Loading

作者：Xue, Fei[1];Zhao, Tongyang[1,2];Feng, Xiaowei[3];Wang, Tianzuo[1];Lin, Zhongqin[1]

机构：[1]Shaoxing Univ, Key Lab Rock Mech & Geohazards Zhejiang Prov, Coll Civil Engn, Shaoxing 312000, Peoples R China;[2]Shandong Univ Sci & Technol, Coll Energy & Min Engn, Qingdao 266590, Peoples R China;[3]China Univ Min & Technol, Sch Mines, State Key Lab Coal Resources & Safe Min, Xuzhou 221116, Jiangsu, Peoples R China

年份：2022

卷号：2022

期号：SpecialIssue11

外文期刊名：LITHOSPHERE

收录：SCI-EXPANDED(收录号：WOS:000855685500011)、、EI(收录号：20222112147106)、Scopus(收录号：2-s2.0-85130482232)、WOS

基金：The authors would like to acknowledge the financial support for this study provided by the National Natural Science Foundation of China (Grant No. 52104094) and the Zhejiang Provincial Natural Science Foundation of China (Grant No. LQ20E080006 and No. LGJ22D020001).

语种：英文

外文关键词：Failure (mechanical) - Stress-strain curves - Elastoplasticity - Crack closure - Acoustic emission testing - Anisotropy - Cyclic loads - Image correlation

外文摘要：To explore the influence of bedding structure on mechanical properties and failure mechanism of anisotropic rocks, six stratified sandstone specimens with different bedding orientations were tested by uniaxial static and cyclic loading. Acoustic emission (AE) and digital image correlation (DIC) were exploited to analyze the mechanism of crack initiation and propagation. The results show that with the increase of the bedding orientation, the peak strength of the stratified sandstone decreases first and then increases, behaving an obvious anisotropic characteristic. The AE characteristic-stress-strain curve can be divided into four stages: crack closure stage, linear elastic deformation stage, stable crack growth stage, and unstable crack growth stage. Moreover, as the bedding orientation increases from 30 degrees to 90 degrees , the crack closure stage gradually lengthens, while the linear elastic deformation stage first shortens and then lengthens. Under uniaxial static compression, due to the presence of bedding surface, the rock surface has a relative slip trend as a result of the uneven distribution of strain on the left and right parts, and the strain field boundary is almost consistent with the bedding orientation. Furthermore, cyclic loading can increase the rock stiffness, and the stain field boundary of 60 degrees stratified sandstone sample in each cycle is slightly different in the cyclic loading.