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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。
In order to study the effect of irregular island face mining on rock burst under deep burial depth, based on the theory of overlying rock spatial structure, the influence of overburden rock structure and its large-scale breaking motion on the coal and rock mass of working face Influence, and according to microseismic monitoring during excavation on the island surface of the impact of the risk of dynamic evaluation. Through theoretical analysis and numerical simulation, the mechanism of island pillars inducement is analyzed from static load and dynamic failure of coal and rock mass. Based on the law of conservation of energy, the stability and energy release and transformation of overburden strata at the moment of main key fracture are studied, and the effect of breaking motion of main key strata on strata behavior is obvious. The impact of different mining scales on island island impact is analyzed by numerical calculation. As the mining scale increases, the peak value of static load stress of coal gradually increases and approaches the critical stress, and the impact risk increases. Finally, based on the combination of dynamic and static load induced island pillars impact mechanism, discussed the island surface pressure prevention and control measures. Field practice shows that pressure relief and pre-cracking blasting effectively control the generation of high-energy vibration events.