单轴压缩下片岩应力记忆持续时间试验研究  

Experimental study on retention time of stress memory in schist under uniaxial compression

作　　者：刘洋[1] 刘长武[1] 余贤斌[2] 谢强[3] 

机构地区：[1]四川大学水力学与山区河流开发保护国家重点实验室,水利水电学院,四川成都610065 [2]昆明理工大学国土资源工程学院,云南昆明650093 [3]重庆大学土木工程学院,山地城镇建设与新技术教育部重点实验室,重庆400045

出　　处：《采矿与安全工程学报》2014年第5期775-780,共6页Journal of Mining & Safety Engineering

基　　金：国家重点基础研究发展计划(973)项目(2010CB226802);国家自然科学基金煤炭联合基金重点项目(51134018);国家自然科学基金青年科学基金项目(51008319);第43批留学回国人员科研启动基金(教外司留〔2011〕1568号)

摘　　要：为了研究时间对岩石应力记忆的影响,利用岩石试验机和SDAES数字声发射检测仪对2次加载时间间隔分别为2,7,15,30和45 d的片岩进行单轴压缩条件下的声发射Kaiser效应试验。试验结果表明：首次加载7 d后再次加载Kaiser效应明显,30 d后还可以观察到Kaiser效应,而45 d后Kaiser效应已难以辨认;随着首次加载与第二次加载间隔时间的增长,岩石Kaiser效应逐渐衰退;首次加载的应力水平影响岩石Kaiser效应的消退,介于岩石强度的30%~80%之间,岩石记忆先前应力的能力最好。In order to study the influence of time on rock stress memory , an experimental study has been performed to investigate the Kaiser effect of acoustic emission on schist at time interval of 2 days, 7 days, 15 days, 30 days and 45 days between the first and second loading under the condition of uniax-ial compression, by making use of rock testing machine, as well as a testing apparatus of AE, SDAES. The test results show that with the increase of time interval between two loading cycles, Kaiser effect in rock gradually disappears and the effect is well-pronounced at time interval of 7 days and remains de-tectable within 30 days, while it is hard to be detected after more than 45 days. The stress level of the first loading affects the fade of Kaiser effect in rock, and rock’s memory ability of precious stress is the best when the stress level of the first loading is of between 30%to 80%of rock strength.

关 键 词：声发射 KAISER效应 单轴压缩 应力记忆 持续时间 

分 类 号：TU459.4[建筑科学—岩土工程]