循环载荷作用下岩石声发射时空演化规律研究

E location experiment based on sandstone has been done with advanced AE test system. Space-time evolvement rule about damage has been analyzed under cyclic loading as well as AE. The research shows: (1) AE about static loading process is consistent with the damage evolvement rule of compress and elasticity-plastic deformation phase; (2) At the beginning of cyclic loading, AE events come from small crack which has low duration time and energy. Location result shows most of the events appear in the core zone forming at the static loading process, and location points change slowly. (3)AE energy change little at the metaphase of cyclic process. There has little increase of Location points every cycle. The AE location events show the tendency of steady development. (4)At the end of the cyclic loading, the quantities of AE events and energy increase rapidly every cyclic, especially the last cycle, is maximum. AE events have high energy and duration time. Location events change much rapidly, and assemble and link continuously in the core zone, at the same time expanding to the top of specimen and forming macroscopical crack at last. (5)In the post-failure process, there still some AE events because of fracture gliding friction. Little AE events still appear because of inner stress balance of rock even stop loading。