卧龙湖矿地面瓦斯抽采钻孔破坏突水特征及原因分析

Analysis on characteristics and causes of water inrush from surface gas drainage boreholes in Wolonghu Coal Mine

以卧龙湖煤矿8101工作面地面瓦斯抽采钻孔受采动影响后破坏并引发工作面发生突水问题为背景,通过对瓦斯孔破坏后工作面涌水量变化特征、钻孔破坏窥视结果等信息进行了分析,结果表明,覆岩中关键层破断后其所控制的大范围岩层整体运动,一定范围岩层内发生拉伸变形并形成离层,造成了钻孔套管在K3砂岩含水层底部的多段拉破坏,致使K3砂岩含水层水通过钻孔直接进入工作面,发生突涌水,由于水量较大,动水注浆比较难,给矿井防治水工作造成了一定的难度。

Taking the deformation of surface gas drainage borehole after coal mining and water inrush problem on 8101 working face of Wolonghu Coal Mine as the background,water inflow changes of working face after the destruction of gas drainage borholes, the results of boreholes damage peep were analyzed. The results show that, large scope of rock strata controlled by key strata move after the key strata in overlying strata broken, rock strata produces tensile deformation in a certain range, and the separation is formed, this results in multi section tension failure of borehole casing in the bottom of K3 sandstone aquifer, the water of K3 sandstone aquifer water can flow into the working face through the boreholes, and water inrush happens.Due to a large amount of water, the dynamic water grouting is more difficult that caused some difficulty for mine water prevention work.