强冲击大采高工作面关键层周期破断规律研究

为探究强冲击大采高工作面关键层周期破断规律,以内蒙古鄂尔多斯母杜柴登矿井30202工作面为例,采用即时加载带理论对上覆岩层进行了划分,在进行了钻孔揭露覆岩层位分析后,理论计算了坚硬砂岩组覆岩周期破断步距,结合微震监测数据分析了影响工作面冲击危险的关键层位。研究结果表明30202工作面上覆岩层中,中高位顶板周期破断对工作面冲击危险存在重要影响,中高位顶板周期性破断期间大能量事件频发,须做好工作面周期来压期间冲击地压防治安全技术措施。

Study on the periodic fracture law of key strata in the working face with strong mine pressure and large mining height

In order to explore the periodic fracture law of the key strata in the working face with strong mine pressure and large mining height,taking No.30202 working face of Muduchaideng mine in Ordos as an example,the overburden strata were divided by the theory of instant loading.Based on the analysis of the strata exposed by drilling,the periodic fracture step distance of the hard sandstone group was calculated,and the key strata affecting the rock burst risk of the working face were analyzed with the microseismic monitoring data.The research results show that in the overburden of No.30202 working face,large energy events occur frequently during the periodic breaking of the middle and high roof,which has a great impact on the rock burst of the working face.Therefore,it is necessary to take safety technical measures to prevent and control the rock burst during the periodic weighting of the working face.