水力发电2024，Vol.50Issue(12)：39-43,111,6.
不同结构面贯通度花岗岩剪切破坏的声发射演化特征
Evolution Characteristics of Acoustic Emission during Shear Failure of Granite with Different Degrees of Discontinuity Penetration
摘要
Abstract
To investigate the acoustic emission evolution characteristics of granite shear failure under different structural plane penetration degrees,a true triaxial rockburst test system is used to conduct direct shear tests on granite with three types of structural plane penetration degrees of 0%,40%and 80%.The acoustic emission signals during the loading to failure process of granite are collected,and their evolution characteristics are studied.The results show that,(a)the structural plane penetration degree has a significant impact on the evolution characteristics of acoustic signals during the fracture process of granite in direct shear tests,and five characteristic values,including the maximum hit count,the cumulative ringing count increase rate before shear slip failure,the"step"height of the cumulative absolute energy curve,the degree of frequency division phenomenon of high-amplitude points,and the mean value of the RA value,all decrease as the structural plane penetration degree increases;and(b)the acoustic emission hit count exhibits a"relative calm period"phenomenon,with the ringing count exceeding 30,000 times,and the RA value and absolute energy remaining high for a certain duration,with a wide frequency range of high-amplitude point distributions.关键词
花岗岩/结构面贯通度/剪切破坏/声发射/直剪试验Key words
granite/structural plane penetration degree/shear damage/acoustic emission/direct shear test分类
天文与地球科学引用本文复制引用
覃子秀,彭晋戈,苏子祥,黄京华,刘宗辉..不同结构面贯通度花岗岩剪切破坏的声发射演化特征[J].水力发电,2024,50(12):39-43,111,6.基金项目
广西自然科学基金资助项目(2024GXNSFAA010300) （2024GXNSFAA010300）
广西重点研发项目(2023AB14011) （2023AB14011）
