深埋复杂不规则孤岛工作面冲击矿压机制研究  

Rock burst mechanism analysis on deep irregular island face

作　　者：朱广安[1] 窦林名[1] 刘阳[1] 苏振国[1] 李慧[1] 

机构地区：[1]中国矿业大学煤炭资源与安全开采国家重点实验室,矿业工程学院,江苏徐州221116

出　　处：《采矿与安全工程学报》2016年第4期630-635,共6页Journal of Mining & Safety Engineering

基　　金：国家重点基础研究专项(973)项目(2010CB226805);国家自然科学基金和神华集团有限公司联合项目(51174285);煤炭资源与安全开采国家重点实验室自主研究课题项目(SKLCRSM10X05);江苏高校优势学科建设工程项目(PAPD)

摘　　要：为研究大埋深下不规则孤岛工作面开采对冲击矿压的影响,基于覆岩空间结构理论,分析了某矿3112孤岛工作面覆岩结构及其大尺度破断运动对工作面煤岩体的影响,并根据掘进期间微震监测对孤岛面的回采进行冲击危险的动态评价。通过理论分析与数值模拟,从煤岩体静载应力和动态破坏2方面分析孤岛煤柱诱冲机制。基于能量守恒定律,研究了主关键层破断瞬间覆岩稳定性和能量释放、转化过程,主关键层的破断运动对工作面矿压显现影响剧烈。数值计算分析了不同开采尺度对孤岛面冲击的影响,随着开采尺度的增大,煤体的静载应力峰值逐渐升高并接近临界应力,冲击危险程度升高。最后基于动静载组合诱发孤岛煤柱冲击机制,探讨了孤岛面冲击矿压防治措施。现场实践表明,钻孔卸压和顶板预裂爆破有效地控制了高能量震动事件的产生。To study the influence of deep irregular island face mining on rock burst, based on the spatial structure theory, the characteristics of overburden structure above island face 3112 have been analyzed in this paper, and the effect of large scale fracturing on the coal and rock has also been analyzed. Also the dynamic information monitored by microseismic monitoring system during roadway excavation has been added for the dynamic evaluation of rock burst risk at the working face. Meanwhile, through theoretical analysis and numerical simulation, the mechanism of rock burst induced by static and dynamic combined load in island pillar coal face has been analyzed. Based on energy conservation law, the release and conversion of the energy at the moment of the key strata fracture have been studied. Subsequently, the influence law of different mining scale effect on island pillar burst has been studied with the method of numerical simulation. The greater the mining scale is,the higher the risk of rock burst will be. Finally, the technologies in controlling rock burst have been developed for island face based on the mechanism. The engineering application has presented that strong tremors can be reduced by releasing pressure through large diameter drilling and break-tip blast in deep hole.

关 键 词：孤岛工作面 冲击矿压 “T”型覆岩结构 动态评估 数值模拟 

分 类 号：TD324[矿业工程—矿井建设]