采掘影响下断层活化产生矿震的力源分析及微震监测
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摘要
受煤矿采掘活动影响,断层活化运动产生的矿震能诱发冲击矿压灾害。采用数值模拟手段研究了采掘影响下断层面上应力的分布规律,并对微震监测数据进行分析。研究结果表明,断层两盘接触面上由于岩层软硬性质的差异,最大主应力值也相应发生变化,存在最大主应力梯度;当采掘活动与断层距离减小时,最大主应力和最大主应力梯度增大,这是断层活化产生矿震的力源。微震震源的时空分布变化也说明采掘活动与断层的距离越近,微震事件越频繁,微震分布也越集中于断层附近,且微震事件的能量也越大,冲击矿压发生的事实也验证了研究成果的合理性。
Mine earthquake induced by fault activation under the action of excavation can bring about rock burst.In the paper,numerical simulation was used to analyze the stress distribution and change regulations on the fault surface under the action of excavation in a coal mine with fault.The research results show that the largest main stress on the fault surface changes due to the different rock properties of the two sides of the fault,and there is a gradient of the largest main stress,and this is the energy source of mine earthquake induced by fault activation.When the distance between the excavation and the fault decreases,the largest main stress and the largest main stress gradient will increase.The spatial and temporal distribution variation of seismic monitoring data also show that the higher energy seismic events become more frequent with the distance between the excavation and the fault decreasing,and the microseismic events are mainly located in the fault regions,too.The later happened serious rock burst has proved the research results are reasonable,and this can give reference function for the prediction of rock burst in the same condition of coal mine.
Mine earthquake induced by fault activation under the action of excavation can bring about rock burst.In the paper,numerical simulation was used to analyze the stress distribution and change regulations on the fault surface under the action of excavation in a coal mine with fault.The research results show that the largest main stress on the fault surface changes due to the different rock properties of the two sides of the fault,and there is a gradient of the largest main stress,and this is the energy source of mine earthquake induced by fault activation.When the distance between the excavation and the fault decreases,the largest main stress and the largest main stress gradient will increase.The spatial and temporal distribution variation of seismic monitoring data also show that the higher energy seismic events become more frequent with the distance between the excavation and the fault decreasing,and the microseismic events are mainly located in the fault regions,too.The later happened serious rock burst has proved the research results are reasonable,and this can give reference function for the prediction of rock burst in the same condition of coal mine.
引文
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[2]齐庆新,陈尚本,王怀新,等.冲击地压、岩爆、矿震的关系及其数值模拟研究[J].岩石力学与工程学报,2003,22(11):1852-1858.
[3]潘一山,李忠华,章梦涛.我国冲击地压分布、类型、机理及防治研究[J].岩石力学与工程学报,2003,22(11):1844-1851.
[4]邰英楼,王来贵,章梦涛.冲击地压的分类研究[J].煤矿开采,1998(1):27-28.
[5]李忠华,潘一山.断层冲击地压的影响因素与震级分析[J].岩石力学与工程学报,2005,24(增1):5026-5210.
[6]RUTH A.HARRIS.Numerical Simulations of Large earthquakes:Dynamic Rupture Propagation on Heterogeneous Faults[J].Pureand Applied Geophysics,2004,161:2171-2181.
[7]Li Zhihua,Dou Linming,Lu Caiping,et al.Study on fault induced rock bursts[J].Journal of China University of Mining and Technol-ogy,2008(18):321-326.
[8]李志华,窦林名,陆菜平,等.断层冲击相似模拟微震信号频谱分析[J].山东科技大学学报,2010,29(4):51-56.
[9]姜福兴,刘伟建,叶根喜,等.构造活化的微震监测与数值模拟耦合研究[J].岩石力学与工程学报,2010,29(增2):3590-3597.
[10]张明伟,窦林名,王占成,等.深井巷道过断层群期间微震规律分析[J].煤炭科学技术,2010,38(5):8-12.
[11]姜福兴,苗小虎,王存文,等.构造控制型冲击地压的微地震监测预警研究与实践[J].煤炭学报,2010,35(6):900-903.
[12]窦林名,何学秋.冲击矿压防治理论及技术[M].徐州:中国矿业大学出版社,2001.
[13]张宏伟.地质动力区划方法在煤与瓦斯突出区域预测中的应用[J].岩石力学与工程学报,2003,22(4):621-624.
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