NUMERICAL SIMULATION FOR ACOUSTIC EMISSION AND SOURCE LOCATION OF ROCK UNDER TRIAXIAL COMPRESSION

Numerical simulation for Acoustic emission (AE) and source location are carried out on the rock specimen granite under triaxial compression using the rock failure process analysis code RFPA(2D). RFPA(2D) is used to determine the fracture process of rock. Moreover, AE source location can be found using RFPA(2D). Numerical simulation shows that there is some microseism precursory before main shock; tension stress is the source of rock failure. Using the space distribution characteristics of AE and information which is produced by tension stress, instability failure can be predicted. Through analysis, it is founded that the previous stage of a microseism event is mainly induced by compression stress, and in the middle and later stage there exists many microseism events which are induced by tension stress. This is useful in practical engineering.