采矿与安全工程学报Issue(5)：788-794,7.
加卸荷条件下胶结充填体声发射b值特征研究
Experimental study on b-value characteristics of acoustic emission of cemented filling body under loading and unloading test
摘要
Abstract
In order to study the response characteristics of cemented filling body under external dis-turbance, the studies have been carried out by virtue of uniaxial cyclic loading and unloading tests on cemented filling body, and the b-value characteristics of acoustic emission (AE) of cemented filling body is examined. The results show that, during the compression phase, the b-value decreases firstly and then increases. By contrast, the b-value declines orderly as stress increases in elastic stage. After undergoing repeated loading and unloading, the b-value reduces greatly as loading stress approaches to the peak stress. Similarly, The AE events are obvious in unloading process. The b-value increases grad-ually when unloading is started from compressing phase. And when unloading is started from elastic phase, the b-value fluctuates in a small range respectively. Finally, the b-value appears step-increasing trend when unloading is started at critical state of cemented filling body. The different b-value charac-teristics indicates that the occurrence of micro crack is in dynamic evolution during loading and un-loading process.关键词
胶结充填体/加载/卸载/声发射b值Key words
cemented filling body/loading/unloading/b-value of acoustic emission分类
建筑与水利引用本文复制引用
龚囱,李长洪,赵奎..加卸荷条件下胶结充填体声发射b值特征研究[J].采矿与安全工程学报,2014,(5):788-794,7.基金项目
国家自然科学基金项目(51064010，50364012)；国家重点基础研究发展计划(973)项目(2010CB731500) （51064010，50364012）
