Abstract: In order to study the response characteristics of cemented filling body under external disturbance, the studies have been carried out by virtue of uniaxial cyclic loading and unloading tests on cemented filling body, and the -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 -value reduces greatly as loading stress approaches to the peak stress. Similarly, The AE events are obvious in unloading process. The b-value increases gradually 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 -value appears step-increasing trend when unloading is started at critical state of cemented filling body. The different -value characteristics indicates that the occurrence of micro crack is in dynamic evolution during loading and unloading process.

Key words: cemented filling body, loading, unloading, -value of acoustic emission