CAJ | 학술논문

为认识胶结充填体在外界扰动下的响应特征，进行了单轴循环加卸载试验，研究了胶结充填体在加-卸载过程中声发射b值特征。试验结果表明：在胶结充填体压密阶段，声发射b值先减小后增大；在弹性阶段，声发射b值随应力的增大而有序下降；经多次加卸载后，当加载应力不断接近峰值应力时，声发射b值持续大幅度减小。在卸载阶段，胶结充填体具有明显的声发射事件。当卸载始于压密阶段时，声发射b值是逐渐增大的；当卸载始于弹性阶段时，声发射b值在小范围内波动；当卸载始于胶结充填体临界状态时，声发射b值呈现“台阶”状上升。声发射b值数值表现出的不同特征，说明在加卸载过程中微破裂处于动态演化之中。
위인식효결충전체재외계우동하적향응특정，진행료단축순배가사재시험，연구료효결충전체재가-사재과정중성발사b치특정。시험결과표명：재효결충전체압밀계단，성발사b치선감소후증대；재탄성계단，성발사b치수응력적증대이유서하강；경다차가사재후，당가재응력불단접근봉치응력시，성발사b치지속대폭도감소。재사재계단，효결충전체구유명현적성발사사건。당사재시우압밀계단시，성발사b치시축점증대적；당사재시우탄성계단시，성발사b치재소범위내파동；당사재시우효결충전체림계상태시，성발사b치정현“태계”상상승。성발사b치수치표현출적불동특정，설명재가사재과정중미파렬처우동태연화지중。
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.