冲击地压的不稳定能量触发机制研究

Unstable energy triggering mechanism of rock burst

为从能量角度揭示冲击地压产生机制,通过理论分析和现场实测微震活动与冲击地压之间的时空内在联系,研究了冲击地压的不稳定能量触发机制,得出了动力灾变的能量触发条件,提出了冲击地压的预测和预防思路.研究表明:当煤岩体具备压制能力高于临界值RE_0的不稳定能量积累机制,且已经积累了超过生成突发性灾害所需要的不稳定能量E_0;同时又产生了强度大于DI_0的初始启动扰动,即:RE>RE_0,E>E_0,DI>DI_0时,会发生冲击地压灾害;累积能量密度云图可以直观地找出冲击地压成核区及其之后能量密度云的演变规律,提前圈定冲击地压潜在危险区.预测冲击地压灾害需要找到确实能代表引起这种突发性灾害的初始启动扰动DI和当时所积累的不稳定能量E的监测指标;预防冲击地压灾害,需要使不稳定能量E小于临界值E_0,或使初始启动扰动DI小于临界值DI_0.

To reveal the rock burst mechanism in the view of energetics,the unstable energy triggering mechanism of rock burst was studied by means of theoretical analysis and in-site monitoring of the temporal-spatial relation between microseismic activities and the rock burst.The trigger conditions were put forward,and the prediction and prevention ideas were proposed.The result shows that when coal or rock has energy accumulation capacity higher than the critical value of RE_0,and has accumulated enough unstable energy needed to produce sudden disasters,meanwhile,when the disturbance intensity is higher than the critical value of DI_0,namely when RERE_0,EE_0,DIDI_0,the rock burst will happen.Accumulated ener-gy density contours can visually present the nucleation zone of rock burst and the subsequent temporal-spatial evolution law,and by which the potential rock burst zones can be delineated in advance.In terms of rock burst prediction,it is necessary to identify montioring indexs which can really represent the initial startup disturbance value of DIand the accumulated unstable energy value of Eat that time.To prevent the disaster,the unstable energy value of Eshould be less than the critical value of E_0,or the initial startup disturbance value of DI should be less than the critical value of DI_0.