安新煤田地下水流场演化规律研究

Evolution law of groundwater seepage field in Anxin coalfield

为系统研究安新煤田地下水补径排关系,掌握安新煤田地下水渗流规律,采用数值模拟的方法,建立了水文地质概念模型,概化了地层结构及模型边界条件,剖析了煤层上部各含水层渗流场的演化规律。结果表明:安新煤田第二含水层在黑河河谷地区具有较高承压水头,随着矿井及周边矿井的开采,对地下水有一定的疏干作用,其水头有一定的衰减;煤顶板上部的砂岩复合承压含水层水头值较大,但该复合含水层的富水性在平面和垂向上均存在着较大差异,且补给条件和富水性差;煤顶板砂岩复合承压含水层对大柳煤矿煤开采影响不大,但对新柏煤矿煤顶板局部存在水害隐患;通过全局灵敏度分析,得出数值模型总灵敏度较小,结果比较稳定,验证了模型的准确性。

In order to systematically study the relationship between groundwater replenishment and discharge in Anxin coalfield, and to master the law of groundwater seepage, a conceptual model of hydrogeology was established by numerical simulation, the stratigraphic structure and the boundary conditions of the model were generalized, and the evolution law of the seepage field of each aquifer in the upper part of the coal seam was analyzed. The results show that: the second aquifer in Anxin coalfield has a high confined water head, and the second aquifer of Anxin coalfield has a high confined water head in Heihe River Valley. Exploitation of the mine and surrounding mines has a certain drainage effect on the groundwater, leading to a certain attenuation of the water head. The sandstone composite confined aquifer on the top of the No.4 coal roof has a larger head value, but the water abundance of the composite aquifer is significantly different in plane and vertical directions, and the recharge conditions and water abundance are poor. The No.4 coal roof sandstone composite confined aquifer has little effect on the mining in Daliu Coal Mine, but there is a hidden danger of water inrush to the No.4 coal in Xinbai Coal Mine. According to the global sensitivity analysis, the total sensitivity of the model is small, and the results are relatively stable, which verifies the accuracy of the model.