基于高精度微震监测的特厚煤层综放工作面顶板运动规律

采用高精度微地震监测技术,研究了微震事件的动态发展规律和分布规律,结合岩石力学和矿山压力与岩层运动理论,推断得到了特厚煤层综放工作面顶板岩层运动规律.随工作面的推进,微震事件先在高位岩层以低密度分布,后在低位岩层呈高密度分布.微震事件发生层位与其最大振幅能量和的对比研究表明,微震事件在高度和时间上具有周期性分布规律,根据矿山压力与岩层运动理论,进而推知特厚煤层综放工作面的顶板岩层运动规律.现场支架工作阻力宏观观测表明,研究得到的特厚煤层综放工作面顶板岩层的周期性运动规律是存在的.

Movement of roof strata in extra-thick coal seams in top-coal caving mining based on a high precision micro-seismic monitoring system

By using an underground high-precision micro-seismic monitoring system, the dynamic development law and the distribution pattern of micro-seismic events (MS events) were analyzed, and the movement law of roof strata in extra-thick coal seams in the fully mechanized top-coal caving mining workface was inferred in combination with the mine pressure and strata movement theory and the rock mechanics theory. Monitoring results show that MS events in higher strata and lower strata are of low-density distribution and high-density distribution, respectively. Comparative studies on the horizon and maximum amplitude energy sum of micro-seismic waves indicate that MS events reveal periodical distribution in height and time. Further more, the movement law of roof strata in extra-thick coal seams in the fully mechanized top-coal caving mining workface was inferred. Macro-observations of support pressure show the conclusion of periodic movement of roof strata is reasonable.