高瓦斯低透气性煤层深孔预裂爆破增透数值模拟  

Numerical simulation of improving permeability by deep-hole presplitting explosion in loose-soft and low permeability coal seam

作　　者：蔡峰[1] 刘泽功[1] 张朝举[2] 林柏泉[3] 

机构地区：[1]安徽理工大学资源开发与管理工程系,安徽淮南232001 [2]皖北煤电集团祁东煤矿,安徽宿州234115 [3]中国矿业大学能源与安全工程学院,江苏徐州221008

出　　处：《煤炭学报》2007年第5期499-503,共5页Journal of China Coal Society

基　　金：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)

摘　　要：针对高瓦斯低透气性煤层,采用Taylor方法建立了一个新的LS-DYNA3D爆破损伤模型,对深孔预裂爆破进行了数值模拟研究,再现了爆破过程中,动压冲击震裂、应力波传播与叠加以及爆生气体驱动裂纹扩展的整个过程,分析了爆破孔间距对爆生裂纹和爆破增透效果的影响,提出了高瓦斯低透气性煤层深孔预裂爆破的合理间距为5-6 m,为高瓦斯低透气性煤层的瓦斯抽放提出了解决方案.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.

关 键 词：高瓦斯低透气性煤层 深孔预裂爆破 应力波 裂纹扩展 叠加效应 

分 类 号：TD235.33[矿业工程—矿井建设]