Numerical Simulation Research on Deep-Hole Prcsplitting Explosion in Coal Seam to Intensified Improve Permeability Based on Taylor Method

摘要

Deep-hole presplitting explosion provides an effective method for promoting permeability of high gassy and low permeability coal seam, and farther solves the difficult problem of gas drainage in this high gassy and low permeability coal seam. The present paper created a new damage model for explosive for LS-DYNA3D, taking advantage of Taylor method aimed at the high gassy and low permeability coal seam, and numerical simulated and analyzed the deep-hole presplitting explosion. Reappeared all of the process of explosion, including cracks caused by dynamic pressure, transmission and vibration superposition of stress waves, as well as cracks growth driven by gas generated by explosion. The influence of the cracks generated in the process of explosion and performance of improving permeability caused by the difference of interval between explosive holes was analyzed. And reasonable interval between explosive holes of deep-hole presplitting explosion in high gassy and low permeability coal seam is proposed. And the.resolution of gas drainage in high gassy and low permeability coal seam is putted forward.