煤层厚度变化区域矿震活动规律研究

Research on Seismic Activities Rules on the Area of Coal Seam Thickness Variation

为更有效地预防采掘期间深部煤层分叉或厚度变化区域冲击矿压的发生,以某矿回采工作面为工程实践背景,基于矿震活动在能量释放与震动频次方面的变化特征及在空间上的分布规律,分析了煤层分叉及煤层厚度变化对冲击矿压的影响。结果表明:在大能量矿震发生前,日震动频次连续处于高位而日释放能量较长时间维持低水平;在煤层厚度变化区域,矿震活动活跃,容易发生大能量矿震。通过对矿震进行"时间-空间"分析,可以确定矿震集中区域和能量积聚时间段,从而可对煤层厚度变化影响区域进行有针对性的卸压防冲工作。

In order to effectively prevent the rock burst disaster occurred in the area of the variation in thickness of the deep coal seam during mining, a mine stope was considered as engineering practice background.The influence of coal bifurcation and coal seam thickness variation to rock burst was ana-lyzed using the distribution of space and the varied features of the energy releasing and vibration frequen-cy in the seismic activities.The results showed that there would be high vibration frequency and low lev-els of energy releasing before the intense seismic activity occurred.Mine earthquake is active and prone to large energy mineral earthquake in changes in the area of coal seam thickness.The analysis of the“time-space”of mine earthquake can determine the concentration of mine earthquake region and ener-gy accumulation period.Thereby targeted relief scour protection work can be taken in seam thickness variation affected areas.