孤岛工作面微震异常区冲击危险震动波反演与防治

Inversion and Prevention of Impact Hazardous Seismic Waves in Anomalous Zones of Microseismicity on Isolated Work Faces

孤岛工作面开采易受周围采空区的影响引发的冲击类动力灾害。针对鲍店煤矿5316孤岛工作面,运用CT探测技术(地震计算机辅助层析成像技术)推断煤岩体内部异常区域的分布情况,并综合CT反演结果和微震监测技术,重点结合相关微震数据及时评估冲击风险。通过控制推采速度,达到降低超前支承压力的效果。研究发现采空区边缘支承压力、铺子断层及联络巷等影响是导致工作面应力异常区的主要因素;超前支承压力可导致顶板下沉,从而导致微震事件能量、频次出现升高。控制工作面推采速度满足工作面煤层及顶板应力调整的时间,避免推采速度持续高位,使工作面应力充分调整,并制定相对应防治对策,确保回采顺利进行。

The working face of isolated islands in coal mining is often susceptible to impact-induced dynamic hazards caused by surrounding goaf areas.In this study,CT detection technology(seismic computer-assisted tomography imaging technology)was applied to infer the distribution of abnormal zones within the coal-rock mass of the 5316 isolated island working face at Baodian Coal Mine.By integrating the CT inversion results with microseismic monitoring technology,the impact risk was promptly assessed using relevant microseismic data.The effect of controlling the advancing mining speed was investigated to reduce the pressure on the advanced supports.The study found that the edge support pressure of the goaf,the fault zone,and the connection roadway were the main factors leading to abnormal stress zones in the working face.Excessive pressure on the advanced supports could cause the roof to sink,resulting in increased energy and frequency of microseismic events.By controlling the mining speed of the working face to meet the time required for stress adjustment of the coal seam and roof,it is possible to avoid continuous high-speed mining,ensure sufficient stress adjustment in the working face,and develop corresponding prevention and control measures to ensure mining operations.