加载速率对不同岩性岩石Kaiser效应影响  

Influence of loading rate on the Kaiser effect for different lithological rocks

作　　者：陈宇龙[1] 张玉[2] CHEN Yulong;ZHANG Yu(State Key Laboratory of Hydroscience and Engineering, Tsinghua University, Beijing 100084, China;College of Pipeline and Civil Engineering, China University of Petroleum, Qingdao 266555, China)

机构地区：[1]清华大学水沙科学与水利水电工程国家重点实验室,北京100084 [2]中国石油大学储运与建筑工程学院,山东青岛266555

出　　处：《煤炭学报》2018年第4期959-966,共8页Journal of China Coal Society

基　　金：国家自然科学基金重点资助项目(51739006);清华大学水沙科学与水利水电工程国家重点实验室科研资助项目(2016-KY-02);中国博士后科学基金资助项目(2017M620048)

摘　　要：选取3种不同岩性的岩石,进行2次不同加载速率的单轴循环加载试验,结合声发射技术,分析加载速率对Kaiser效应的影响。结果表明:若前期所承受过的最高应力水平超过损伤应力时,Kaiser效应失效,Felicity效应成立。Felicity比的变化趋势也能充分反映岩石损伤的演化过程。基于应力和其他物理力学参数的Felicity比均随着加载速率的增加呈增大趋势。加载速率对脆性岩石的Kaiser效应影响较小,对塑性软岩的Kaiser效应的影响显著。岩石内部矿物成分、含量、胶结方式和结构等差异,导致了各种岩石力学特性和声发射特征的不同。加载速率越大,岩石的峰值强度越高,累计振铃计数越小。Two cyclic loading tests with the rate different from one to the other one were conducted on three different lithological rocks to reveal the influence of loading rate on the Kaiser effect for rock,combined with acoustic emission technology. Kaiser effect fails as the experienced load exceeds crack damage stress. Instead,Felicity effect replaces.Felicity ratio could be used as a quantitative measure of the quality of rocks. FR of stress,together with other mechani cal parameters,increases with increasing loading rate. It is found that the dependency of the Kaiser effect on loading rate should be small for brittle and hard rock,but pronounced for ductile,plastic and soft rock. The difference in exam ining Kaiser effect between rock types strongly depends on the variation in mineral composition and microstructure,that is,the effect is pronounced for a ductile rock and insignificant for a brittle rock.

关 键 词：加载速率 KAISER效应 Felicity效应 声发射 岩性 

分 类 号：TD315[矿业工程—矿井建设]