巨厚覆岩破断运动与矿震活动规律研究

Study on movement law of ultra thick overlying strata broken and coal mine earthquakes

基于采场上覆岩层活动规律和冲击地压相关理论,以鲍店煤矿十采区103上工作面为研究对象,采用数值模拟和理论分析的方法,研究了上覆巨厚岩层的运动规律及诱发矿震的因素,通过对现场微震监测数据进行分析,验证了矿震事件与上覆岩层运动间的相关性。研究表明:"红层"砂岩未破断失稳前,工作面上方的2层亚关键层以组合形式运动,伴随能量小于104J的小矿震事件频发并贯穿整个工作面。当工作面推进到约350 m时,"红层"砂岩发生初次破断失稳,同时能量高于105J的强矿震事件频发,"红层"砂岩层位的矿震事件在平面位置上近似呈横向"O—X"型分布,在剖面位置上由"红层"砂岩下部逐渐向中部发展。

Based on the theory of overlying strata movement laws and rock burst,taking No.103 upwork face at ten mining block in Baodian Mine as the study object,the movement law of ultra thick overlying strata broken and the factors induced coal mine earthquakes were researched by computer numerical simulation and theoretical analysis.The relativity between overlying strata movement and mine earthquakes was verified through analyzing site micro-seismic data.The results showed that before the red sandstone broken,the two inferior key strata moved together above work face,small mine earthquakes occurred frequently at the whole work face under the micro earthquake energy 104 J.When the work face advanced to 350 m,the red sandstone broken at first time and the strong earthquakes occurred frequently under the micro earthquake energy105 J. The earthquakes events of red sandstone distributed with O—X form on the plane and developed from bottom to central in section.