分层开采煤矿的矿震能量释放模型与能量释放谱

A rockburst energy release model and energy release spectrum for coalmines in layered grounds

以下行分层开采的我国东北某大型煤矿为工程背景,通过现场微震观测和工程数据分析,探索矿震能量释放的时空分布规律及其工程应用价值.发现在没有显著的外部长周期调制动力流入的矿区,各相同地应力强度环境持续开采引发的矿震能量累积释放的时域分布均符合3参数的S形Logistic阻滞增长模型;不同地应力强度环境间,该模型的3个参数是地应力强度的自相似函数.通过最大主应力建立起不同地应力强度环境开采进程的典型矿震能量释放谱,定量揭示了开采活动与矿震能量释放间的内在联系及力学机理.

Presented a model to quantitatively investigate the spatial and temporal distribution of rockburst energy release and its engineering application at a large-scale coalmine in layered ground in the Northeast region, by adopting approaches of field microseismic monitoring and data analysis. It is found that, in mining areas where there are no obvious long-term external force disturbances, the accumulated total energy release in the time domain at a specific mining level can be described by a three-parameter, S-shaped Logistic model. These three parameters in the model are functions of in-situ stress intensity. Using the maximum principal stress component, a series of energy release curves at different mining depths were calculated to obtain a typical energy release spectrum which quantitatively demonstrates the relationship between mining activity and rockburst energy release. The mechanism of this interrelationship was also investigated.