Acoustic Emission Characteristics of Weak Impact-prone T_3xj~6 Sandstone

In order to understand the acoustic emission characteristics of weak impact-prone sandstone,experiments of T3xj6 sandstone in Yongchuan coalmine were tested by means of MTS815 rock testing system and AE testing system.Results of the tests indicated that there were large differences of the acoustic emission signals produced in different stages of sandstone loading process.The variation of spatial distribution of AE events reflected the failure process of sandstone damaged.The Kaiser and Felicity effects existed in T3xj6 sandstone.The research provided a scientific basis for the prediction of rock dynamic disaster by using AE monitoring technology in coalmines.