采动条件下煤层底板岩层渗透率变化过程研究

摘要

The goaf water burst is one of the main types of mine water disaster,the accurate exploration of water inrush points can effectively prevent water inrush in goaf.This paper introduced the layout of the observation hole of pressure water test in Xinzhi Coal Mine.The change process of the maximum damage depth and permeability of floor strata in coal floor was test and analyzed.The pressure water test of coal floor before and after mining showed that the permeability of the rock strata below the bottom is obviously decreased with excavating activities in the working face and water resisting ability has a gradual recovery trend.It was inferred that the area with unrestored water proof ability has higher probability of water inrush after mining,it can provide basis for the exploration of water inrush passage in post-harvest water treatment.%采空区突水是矿井突水的一种主要类型,对突水点的准确探查可以有效防治采空区突水.介绍了辛置煤矿压水试验观测孔的布置情况,测试分析了煤层底板最大破坏深度、底板岩层渗透率的变化过程.采前、采后煤层底板的压水试验表明:在底板采动破坏带以下一定厚度岩层的渗透率随工作面推采一定距离后有明显的降低,隔水层阻隔水能力有逐渐恢复的趋势.由此推断阻隔水能力还未恢复的区域为采后突水概率较高的区域,可为采后出水治理中突水通道探查提供依据.