矿井工作面回采对微震活动的影响研究

Research on influence of microseismic activity by working face mining in coal mine

为有效揭示煤矿工作面矿震、冲击地压灾害的发生规律。结合东滩煤矿微震监测的震动能量、频次特征,工作面开采速度特征以及采动应力分布特征,研究了矿井工作面的回采参数对微震分布的影响规律。结果表明,工作面回采速度增加,大能量矿震爆发的非线性特征增强,工作面开采速度大于4m/d时,工作面发生冲击地压可能性大大增加,匀慢速回采是降低大能量矿震事件爆发有效途径;大能量矿震爆发的周期特性在东滩煤矿43上13工作面表现为100m大周期内包含50m的小周期;大能量矿震爆发与工作面整体应力环境正相关,周期来压、工作面"见方"时段为大能量矿震频发时段。

In order to reveal the occurrence characteristics of shock bump and rock burst.The influence of working face mining on microseismic distribution are researched combined shock energy,shock times,mining speed of working face and mining stress distributin in Dongtan coal mine.The results show that nonlinear characteristics of high energy shock bump mainfest along with the mining speed increasing.Uniform and slow mining is the effective way to decrease high energy shock bump.there has always been existing aperiod of energy accumulation and storage before the high energy mining earthquake breaks out in a surrounding cycle of about 100 mlong which demonstrates that the gap between the great distance cycle and that of the small cycle would be at about 50 min the aforementioned working face of the mine.High energy shock bump occurrence is positive correlation to the stress environmental of all working face.Periodic pressure,working face"square"is the frequently occurrence time interval.