综放工作面冲击地压的监测预报技术研究

Research on monitoring and forecasting technology of rock burst in fully mechanized caving face

运用包括微震、钻屑法、围岩变形量、顶板离层、锚杆锚索应力综合监测技术手段,提高了冲击地压预测预报的精度。通过冲击地压多种监测技术的研究分析,得出以下结论:微震事件主要沿着断层的走向分布,其周期性与工作面的来压周期也十分的吻合,且工作面一次"见方"时较易发生大能量微震事件;钻屑量随着钻孔深度的增加,其煤粉量成线性增加;受断层切割及回采速度较慢因素的影响,围岩发生变形充分,围岩变形量较大,不利于顶板的维护;实体煤巷道相对于沿空巷道其微震事件、煤粉钻屑量、顶板离层值、锚杆、锚索测力计值均要大,但围岩移近量要小。

The accuracy of prediction and prediction of rockburst is improved by means of comprehensive monitoring technology including microseismic method,drilling cuttings method,surrounding rock deformation,roof separation and anchor cable stress.Through the study of a variety of rockburst monitoring technology analysis,draw the following conclusions:the main microseismic events along the fault strike,the periodic and the pressure cycle is also very fit,and face a"square"is more prone to large energy microseismic events;drill cuttings with the increase of the drilling depth,the the amount of pulverized coal increases linearly;affected by fault cutting and mining speed,surrounding rock deformation,the deformation of surrounding rock in large quantities,is not conducive to the maintenance of solid coal roadway roof;relative to the roadway along gob of microseismic events and coal cuttings,pink roof separation,anchor and anchor values were larger,but the surrounding rock close to a small amount.