顶板探放水工作在工作面水文地质条件分析中的应用

Application of Roof Water Sounding and Releasing in Analysis of Hydrogeological Conditions of Working Face

针对呼吉尔特矿区侏罗系中统巨厚砂岩含水层在地面勘探过程中大段抽水,对工作面水文地质条件分析指导性不强的问题,以该矿区典型煤矿为例,实施了首采工作面探放水钻孔施工、水化学测试和放水试验等工作,并在含水层精确定位、水化学特征、水文参数修正等方面开展了研究。研究结果表明:当井下探放水钻孔揭露细、粉砂岩时,基本不出水。当揭露中粗砂岩时,出水量普遍在10 m^(3)/h左右,个别钻孔达到60 m^(3)/h;该首采工作面导水裂隙带发育范围内赋存3层含水层,由下至上富水性逐渐增加,矿化度分别在2 500、1 500、950 mg/L左右;井下放水试验获取的K值为0.064 57~0.272 88 m/d,远大于地面抽水试验的0.035~0.057 85 m/d;利用探放水成果修正后的水文地质参数预计的矿井涌水量与实际水量平均误差为9%。研究成果提高了工作面涌水量预测的准确性,为相似地区顶板水害防治提供技术支持。

Aiming at the problem of large-scale pumping of the Jurassic Middle Jurassic sandstone aquifer in the Hujierte mining area during the surface exploration process is not strong for the analysis of the hydrogeological conditions of the working surface. Taking the typical coal mine in the mining area as an example, the drilling construction of water exploration and drainage, hydrochemical test and water discharge test were carried out in the first mining face, and the research was carried out in the aspects of accurate positioning of aquifer, hydrochemical characteristics and hydrological parameter correction. The results show that when the fine and siltstone is exposed by the downhole exploration and release drilling, there is no water basically.When the medium-coarse sandstone is exposed, the water output is generally about 10 m^(3)/h, and individual boreholes reach 60 m^(3)/h;there are three layers of aquifers within the development range of the water-transmitting fracture zone of the first mining face, and the water richness gradually increases from bottom to top, the salinity is about 2 500, 1 500, 950 mg/L respectively;the K value obtained in the underground water discharge test is 0.064 57-0.272 88 m/d,which is much larger than the 0.035-0.057 85 m/d in the ground pumping test;the average error between the estimated mine water inflow and the actual water volume of hydrogeological parameters is9%. The research results have improved the accuracy of the prediction of water inflow at the working face and provided technical support for the prevention and control of roof water hazards in similar areas.