【摘要】 建立了煤岩体单元变形破坏过程中能量输入、积聚、耗散、释放的理论计算模型，基于冲击启动理论和围岩变形破坏后的结构防冲能力，提出冲击失稳判据及危险性判断流程。以孟村4号煤层掘进巷道冲击显现事故为工程案例，分析了巷道掘进后围岩变形破坏、能量演化特征，判别了冲击危险性，验证了冲击危险性评估流程的正确性。分析了地应力对冲击危险性的影响。结果表明：水平偏应力越大，冲击危险性越高；掘进方向与最大水平应力垂直时，冲击危险性最高，与最大水平主应力平行时，冲击危险性最低。以冲击变形能非线性增大速率为判别准则，计算出临界采深。本文案例中，采深超过500m后，冲击变形能变化速率较浅部变化速率增大了10倍。造成冲击危险性非线性增大的原因是煤岩体能量积聚和释放增长速率在500m后显著增大：能量积聚增长速率为埋深小于500m时的5.3倍，能量耗散基本不变，能量释放增长速率为1.8倍。更多还原

【Abstract】 This paper established a theoretical calculation model for energy input,accumulation,dissipation,and release in the process of deformation and failure of the coal-rock mass element,and proposed a burst criterion and risk assessment process based on the theory of rock burst start-up and anti-impact capacity of structure after deformation and failure of surrounding rock. Taking the rock burst case in Mengcun No.4 coal seam heading roadway as an engineering case,the energy evolution characteristics of deformation and failure of surrounding rock after roadway excavation was analysed and the risk of rock burst was distinguished. Then the assessment process of rock burst proneness was verified and the influence of geo-stress on rock burst risk was analysed. The results show that burst proneness possibility increase with horizontal deviatoric stress increase. Burst proneness possibility is highest when the excavation direction is perpendicular to maximum horizontal stress,and it is lowest when it is parallel to maximum horizontal stress. Taking the nonlinear increase rate of impact deformation energy as criterion,a critical mining depth was calculated. In this calculation case,the change rate of impact deformation energy was 10 times higher than that of the shallow part when the mining depth over 500m. The reason for the nonlinear increase in burst risk was that the growth rate of energy accumulation and release in coalrock mass increased significantly after 500m:the energy accumulation growth rate was 5.3 times,the energy dispersion was basically unchanged and the growth rate of energy release was 1.8times of that when the buried depth was less than 500m.更多还原