煤矿开采冲击地压启动理论

THEORY OF ROCKBURST START-UP DURING COAL MINING

依据微震监测结果,通过总结分析,指出冲击地压发生过程经历3个阶段,将冲击地压重新分为集中静载荷型和集中动载荷型,建立2种类型的工程结构模型,分析各自冲击启动的能量判据,引进"不确定性系统分析法",提出统一的煤矿开采冲击地压启动理论。结果表明,采动围岩近场系统内集中静载荷的积聚是冲击启动的内因;可能的冲击启动区为极限平衡区应力峰值最大区;应用冲击启动理论能够揭示2类典型冲击案例冲击过程,并将冲击地压的时间序列与空间序列对应起来,为冲击地压监测与防治提供指导。

By summing up the results of case analysis and microseismic monitoring,the three periods during rockburst occurred are pointed out.The types of rockburst are newly divided into centralized static load type and centralized dynamic load type,and engineering structure models of two kinds of rockbursts are established;then,energy criteria of rockburst start-up are analyzed,at last,theory of rockburst start-up during coal mining is put forward.The results show that,the intrinsic factor of rockburst stat-up is the excessive accumulation of static load in near-field system of mining rock;the possible areas of rockburst start-up are the maximum peak areas of stress in the region of limit equilibrium;the process of rockburst of two typical cases of rockburst can be analyzed by using the theory of rockburst start-up;and the time series and spatial series of rockburst are corresponded;so a guidance is provided for detection and prevention of rockburst.