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矿震的发生受多个因素耦合控制。为研究不同诱因条件下矿震分布对冲击地压的影响,基于反演计算推导,得到走时与临界距离公式,并借助微震检测手段,结合现场开采实际,从关键层运动、回采速度的稳定性的角度分析矿震发生机制与分布。研究发现,矿震的发生可分为若干个活动周期,强矿震的发生均处在矿震活动周期内峰值位置;关键层处微震信号最为集中,信号首先于基本顶处集聚,后逐渐向关键层扩展,后再次于基本顶处集中显现;回采速度的变化能够引起突发性顶板垮落,加快回采速度,会造成工作面前方出现高应力集中区,且高应力集中区随工作面的推进逐步向工作面靠近;日进尺突然增加使里氏震级与频次的曲线出现较为强烈的波动。
The occurrence of mine earthquakes is controlled by several factors. In order to study the influence of mine earthquake distribution on rockburst under different inducement conditions, a formula of travel time and critical distance was derived based on inversion calculation. With the help of microseismic detection and field mining, the stability of recovery rate Analysis of Mechanism and Distribution of Mine Earthquakes. It is found that the occurrence of mine earthquakes can be divided into a number of active cycles. The occurrence of strong mine earthquakes is all at the peak position during the period of mine activity. The signals of microseismicity at the key layers are most concentrated. The signals first gather at the basic top and then gradually The key layer expands and then appears again at the top of the basic spot. The change of mining recovery rate can cause sudden roof collapse, and the speed of recovery can cause the high stress concentration area in front of the work surface and the high stress concentration area varies with the working surface And gradually pushed closer to the work surface. The sudden increase of daily footage led to a rather strong fluctuation of the Richter scale and frequency curve.