China Coal Research Institute
CCTEG Xi’an Research Institute (Group) Go. , Ltd.
China Coal Mine Hazard Prevention and Control National Key Laboratory-Sub-laboratory for Mine Water Hazard Prevention and Con-trol
Shaanxi Key Lab of Mine Water Hazard Prevention and Control

我国矿山安全生产形势明显好转,但水害事故是矿井主要灾害之一,准确预测工作面回采过程中底板破坏程度是承压水上采煤水害防治的关键技术之一。根据葛泉矿东井地质特征和11916工作面具体情况,利用“井-地-孔”联合微震监测技术,对回采中底板破坏过程进行监测,在微震定位的基础上,采用微震事件数量直方图和密度图的统计方法,初步获得底板破坏深度为15m;根据地质数据建立三维地质模型并划分均匀网格,结合微震发生位置、释放能量及数量等震源参数,计算每个网格的能量密度,采用MC算法最终获得底板破坏曲面。结果表明,底板破坏深度不仅与微震事件数量有关,还与微震释放能量、破坏半径以及巷道底板起伏有关,从底板破坏曲面分析得出回风巷道底板破坏深度约为10m,运输巷附近底板破坏深度约为15m。最后,将其与钻孔压水试验测试得到的数值对比,证明基于微震监测底板破坏曲面预测方法能更加准确、精细获得底板破坏分布情况。

China’s mine safety situation has improved significantly, but the water damage accident is still one of the main disasters during mine production. Accurate prediction of the floor damage during face recovery is one of the key technologies for the prevention and control of water damage in coal mining on confined water. Based on the geological characteristics of Gequan Mine east well and the specific situa-tion of No. 11916 working face, use the “well-ground-hole” joint microseismic detection technology to monitor the process of the dam - age of the floor during the mining process. On the basis of microseismic localization, using the microseismic time histogram and the statis-tical method of the density diagram, the preliminary obtained the depth of damage of the floor is m. Based on the geological data, evenly divided grids, the energy density of each grid is calculated by combining the seismic source parameters such as the location of microseis-mic occurrence, the released energy and the quantity, etc. The MC algorithm is used to finally obtain the damage surface of floor. The re-sults show that the damage depth of floor is not only related to the number of microseismic events, but also related to the energy released by the microseismic events, the damage radius, and the undulation of the roadway floor. The analysis of floor damage surface reveals that the damage depth of the base plate of the return-airway roadway is about m, and the depth of floor near transportation roadway is about m. Finally, comparing the results with the values obtained from the borehole hydraulic pressure test, the method of prediction of the damage surface of floor based on microseismic monitoring can more accurately and carefully obtain the damage distribution of floor.

国家重点研发计划项目(2022YFC3005601);国家自然科学基金面上项目(42374176)

李萍,姜旭,段建华,等.基于微震监测的工作面底板破坏曲面提取方法[J].煤炭工程,2024,56(11):140-148.