长平矿老空区透水试验研究

Research on Water Permeability Test of Old Goaf in Changping Mine

为评价煤矿老空水污染地下水的程度和范围,摸清老空区地下水水文地质条件,总结含水层受采动影响水文变化规律,为今后地下水资源保护与利用提供经验,以长平矿浅部采动老空区为例,提出使用“稳定流潜水完整井法”开展抽水和压水工程试验。试验结果表明:受采掘活动影响的采空区和上三带区域地层的透水系数是不受影响区域基岩的10~1000倍,评价采空区地下水的污染范围可根据岩层透水系数的大小规律进行定量评价,断层透水性高低对采空区附近地下水流场改变起着重要的作用。

In order to evaluate the degree and scope of groundwater pollution caused by coal mine old goaf water,understand the hydrogeological conditions of groundwater in old goaf,summarize the hydrological changes law in aquifers affected by mining influence,and provide experience for the protection and utilization of groundwater resources in the future,taking the shallow mining old goaf of Changping Mine as an example,the"stable flow phreatic water complete well method"is proposed to carry out pumping and pressurized-water engineering tests.The experimental results show that the water permeability coefficient of the strata in the goaf and the upper three-zone area affected by mining and excavation activities is 10-1000 times higher than that of the bedrock in the unaffected area.The evaluation of the pollution range of groundwater in the goaf can be quantitatively evaluated according to the magnitude law of the water permeability coefficient of the rock strata.The water permeability level of faults plays an important role in changing the groundwater flow field near the goaf.