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《Journal of China Coal Society》 2007-05
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Numerical simulation of improving permeability by deep-hole presplitting explosion in loose-soft and low permeability coal seam

CAI Feng1,LIU Ze-gong1,ZHANG Chao-ju2,LIN Bai-quan3(1.Department of Resources Exploration and Management Engineering,Anhui University of Science and Technology,Huainan 232001,China;2.Qi-dong Coal Mine,Wanbei Coal-electricity Group,Suzhou 234115,China;3.School of Mining and Safety Engineering,China University of Mining and Technology,Xuzhou 221008,China)  
A new damage model was built for explosive for LS-DYNA3D by taking advantage of Taylor method aimed at the high gassy and low permeability coal seam,and the deep-hole presplitting explosion was numerical simulated.Represent all of the explosion process,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(5~6 m) between explosive holes of deep-hole presplitting explosion in high gassy and low permeability coal seam was proposed.And the resolution of gas drainage in high gassy and low permeability coal seam was put forward.
【Fund】: 国家自然科学基金重点资助项目(50534090);; 安徽省优秀青年基金资助项目(2006jq1059);; 安徽省高校科技创新团队计划资助项目(2006KJ005TD);; 安徽省自然科学基金资助项目(050440403)
【CateGory Index】: TD235.33
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