大埋深倾斜厚煤层下导水裂隙带发育高度的微震监测

Micro-seismic monitoring of development height of water-corducting fracture zone under inclined thick coal seam with large buried depth

以九龙矿15249S工作面为工程背景,利用微震监测技术对上覆岩层塑性区破坏变化规律及导水裂隙带发育高度进行监测,并结合理论计算、数值模拟与现场实测结果进行对比,验证微震监测较高的准确性。结果表明,微震监测结果更为接近现场实测数据。监测结果显示:工作面及其回采巷道上方130 m范围内,微震事件分布密集、能量较大,故该空间内上覆岩体破坏变形较为严重,裂隙较为发育;当超过130 m时,微震事件骤减,数量几乎为0;因此得到导水裂隙带发育高度为130 m。研究成果可为九龙矿的安全生产提供可靠参考,并为类似的大埋深倾斜厚煤层工作面提供一种有效监测导水裂隙带发育高度的方法。

The development height of water-conducting fracture zone is one of the important reference indexes for predicting mine water disaster.In this paper,the 15249S working face of Jiulong mine is taken as the engineering background.This working face belongs to the typical type of large buried depth inclined thick coal seam.The micro-seismic monitoring technology is used to monitor the failure variation law of plastic zone of overlying strata and the development height of water-conducting fracture zone.The results are compared with the results of theoretical calculation,numerical simulation and field measurement to verify the high accuracy of micro-seismic monitoring.The results show that the micro-seismic monitoring is closer to the field measurement results,and the analysis of the monitoring results shows that the micro-seismic events are densely distributed and the micro-seismic energy is large in the range of 130 m above the working face and the mining roadway.It is known that the failure deformation of the rock mass in the space is more serious,and the cracks are more developed.When the distance is more than 130 m,the number of micro-seismic events is almost zero,and the development height of the water-conducting fracture zone is 130 m.The research results provide a reliable reference for the safe production of Jiulong mine,and provide an effective method to monitor the development height of water-conducting fracture zone for similar large buried depth inclined thick coal seam working face.