Dynamic stress analysis and application for gas drainage through strata by presplitting blasting

Based on application of through strata blasting in Nantong coal mine, Chongqing energy corporation, this paper analyzes the arrangement characters of the blasting holes and establishes numeric model of through strata blasting using nonlinear dynamic analysis software DYNA 3D. In the papers, destruction range of each blasting hole and dynamic stress deformation of different control holes are studied. After that, these are compared with actual drainage effect of each hole. And rules of through strata blasting are explored.