Time-sensitivity mechanism of rock stress memory properties under tensile stress  

作　　者：Yuxin Ban Xiang Fu Qiang Xie Jun Duan 

机构地区：[1]School of Civil Engineering,Chongqing University,Chongqing,400044,China [2]Key Laboratory of New Technology for Construction of Cities in Mountain Area,Chongqing University,Chongqing,400044,China [3]School of River and Ocean Engineering,Chongqing Jiaotong University,Chongqing,400074,China [4]Changjiang River Scientific Research Institute of Changjiang Water Resources Commission,Wuhan,430010,China

出　　处：《Journal of Rock Mechanics and Geotechnical Engineering》2020年第3期528-540,共13页岩石力学与岩土工程学报（英文版）

基　　金：funded by the National Natural Science Foundation of China(Grant No.51779021);Chongqing Natural Science Foundation(Grant No.cstc2019jcyj-msxm2176);Scientific and Technological Research Program of Chongqing Municipal Education Commission(Grant No.KJQN201800745).

摘　　要：In deep underground engineering,understanding of time-related stress memory properties is critical to evaluate the in situ stress conditions of a rock mass.In this study,the time-sensitivity mechanism of the rock stress memory properties under tensile stress was investigated.It was found that the material property(Poisson’s ratio)and crack angle were the controlling factors of the Kaiser effect(KE)under tensile stress.In particular,the time-sensitivity of the stress memory properties was closely related to the crack growth path.When the failure of the rock specimen was dominated by tensile microcracks and the crack development direction was deflected by up to 30°in the successive loading process,the stress memory capacity was likely to be time-independent for a sandstone specimen.The distribution of the Felicity ratio in a Brazilian test was more discrete than that in a three-point bending test It also showed that the changes in the crack path,rather than the time interval between successive loading cycles,led to inaccuracy of the detected KE.This study provides insights into stress memory-related issues under uniaxial or more complex stress conditions and thus facilitates development of methods for testing in situ mechanical behaviors of rocks with acoustic emission(AE)technology.

关 键 词：Acoustic emission(AE) Time-sensitivity Stress memory Kaiser effect(KE) Brazilian disc rotation Power spectrum 

分 类 号：TU452[建筑科学—岩土工程]