冲击地压与微震影响因素的关系研究

发布时间：2018-07-21 17:31

【摘要】：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。
[Abstract]:The occurrence of mine earthquake is controlled by multiple factors coupling. In order to study the influence of mine earthquake distribution on the impact ground pressure under different inducement conditions, based on the inversion calculation, the formula of walking time and critical distance is obtained, and by means of microseismic detection, combined with the field mining practice, the movement of key layer is obtained. The mechanism and distribution of mine earthquakes are analyzed from the angle of stability of mining speed. It is found that the occurrence of mine earthquakes can be divided into several active periods, and the occurrence of strong ore earthquakes is in the peak position within the period of mine earthquake activity, and the microseismic signals at the key layers are the most concentrated, and the signals first gather at the basic top, and then gradually extend to the key layers. The change of mining speed can cause sudden roof collapse, accelerate mining speed, and cause high stress concentration area in front of face. And the high stress concentration area is approaching to the working face with the advance of the working face, and the sudden increase of the daily ruler makes the curve of magnitude and frequency of the Richter earthquake appear more intense fluctuation.
【作者单位】：辽宁工程技术大学力学与工程学院;辽宁大学;
【基金】：国家重点研发计划(2016YFC0801401) 国家自然科学基金资助(51174107,51374119) 国家青年自然科学基金资助(51404131)
【分类号】：TD324

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