基于微震监测的特厚煤层综放开采覆岩运移规律研究

Research on Overlying Rock Movement and Displacement Law in Fully Mechanized Caving Mining of Extra Thick Coal Seams Based on Microseismic Monitoring

为研究斜沟煤矿23103工作面浅埋特厚煤层综放开采的覆岩破断运移特征,采用高精度微震监测系统,监测三维空间范围覆岩破裂发生的位置及释放能量。监测结果表明:覆岩低层位范围内,微震事件发生密集。高位岩层破裂时,同步伴有低位岩层破裂事件的发生,表明了高位岩层破断失稳,易造成下赋低位岩层的同步破断失稳,并进一步对工作面矿压产生影响。基于微震监测的覆岩破断失稳规律研究,为矿井矿压控制及顶板灾害预控提供了科学依据。

To study the characteristics of overlying rock fracture and migration in the shallow buried and thick coal seam fully mechanized top coal caving mining of the 23103 working face of Xiegou Coal Mine,a highprecision microseismic monitoring system was adopted to monitor the location and energy release of overlying rock fracture within a three-dimensional spatial range.The monitoring results indicate that there is a dense occurrence of microseismic events within the lower strata of the overlying rock.When a high-level rock layer ruptures,the occurrence of a low-level rock layer rupture event simultaneously indicates that the high-level rock layer is unstable and prone to synchronous fracturing of the underlying low-level rock layer,which further affects the mining pressure of the working face.The study on the law of overlying rock fracture and instability based on microseismic monitoring provides a scientific basis for mine pressure control and roof disaster prediction.