深部矿井过探巷微震分布规律及裂隙带高度预测

Distribution Pattern of Microseismic and Prediction of Fault Zone Height in Deep Mine Roadway

针对矿井开采深度大,受断层构造影响严重,为充分回收煤炭资源,合理布置工作面,多采用探巷查明构造,工作面回采过程过探巷时极易发生冒顶,严重影响安全高效回采的情况,以冀中能源股份有限公司邢东矿1224工作面开采为例,采用高精度微震监测技术对探巷附近围岩的微破裂活动实施实时连续监测,结合顶底板破裂规律,统计分析微震数据,运用尖点突变理论和k-means聚类算法,得到工作面裂隙带高度为69~81m,与现场实际监测数据一致。研究表明,探巷超前加固应选择在探巷围岩未受到超前支承压力影响之前,超前距不小于60m。工程实施后,工作面顺利通过探巷,实现了安全回采。该模型可用于预测顶板导水裂隙带高度,指导矿井对探巷进行超前加固支护。

In response to the deep mining depth and severe impact of fault structures,in order to fully recover coal resources and arrange the working face reasonably,the structure of roadway is often used to identify.When the mining process passes through the mine roadway,roof collapse is prone to occur,which seriously affects safe and efficient mining.Taking the 1224 working face of Xingdong Mine in Jizhong Energy Group Co.,Ltd.as an example,high-precision microseismic monitoring technology is used to implement real-time continuous monitoring of the micro fault activity of the surrounding rock near the exploration tunnels.Combined with the roof and floor faults,microseismic data is statistically analyzed.Using the cusp catastrophe theory and k-means clustering method,the height of the fault zone in the working face is obtained to be 69~81m,which is consistent with the actual monitoring data on site.Research has shown that the advance reinforcement of mine roadway should be selected before the surrounding rock is affected by the advance support pressure,and the advance distance should not be less than 60m.After the implementation of the project,the working face passed through the mine roadway smoothly and achieved safe mining.This model can be used to predict the height of the roof water conducting fault zone and guide the mine to carry out advanced reinforcement support for roadway.