Acoustic Emission Characteristics and Damage Evolution of Sandstone with Different Pores under External Load

The rock will be damaged and destroyed when the external load reaches bearing limit, which accompanied by complex AE signals damage evolution laws. Therefore, in order to obtain relationship between signal characteristics of rocks, 4 kinds sandstones a mine are used for test. Firstly, porosity sandstone is tested. Secondly, parameter with different analyzed. Finally, parameters obtained combined cellular automata theory analyze law critical value sandstones. results show that pore size four QSYX > QSYZ FSYX FSYZ. loading process divided into compaction stage, elastic deformation plastic peak strengths 46.92 MPa, 43.32 57.87 54.31 respectively. Or event rate, missing area, parts number different. area larger than FSYZ; macrocrack growth speed also faster; signs fracture obvious. more QSYX, QSYZ, first two caused internal defects; last fracture; FSYZ shear failure, tensile failure. corresponds one one. calm stage expansion acceleration stage. values 0.438, 0.499, 0.576, 0.476, respectively, higher cell model 0.43, indicating reach value, instability exists failure occur continuous load.