煤矿开采对地下水流场影响的数值模拟——以神府矿区大柳塔井田为例

煤矿开采过程中的矿坑排水对地下水流场和地下水资源利用具有强烈影响.本文通过建立平面二维地下水渗流模型,模拟煤矿开采后地下水流场的变化.模型识别校验后,对煤矿开采后地下水流场的变化趋势进行了预测.预测结果表明,随着采煤范围扩大,矿坑排水量增加,地下水循环途径被改变,充水含水层被疏干,导致泉水断流.

A NUMERICAL SIMULATION ON THE INFLUENCE OF UNDERGROUND WATER FLOW REGIME CAUSED BY COAL MINING A CASE STUDY IN DALIUTA, SHENFU MINING AREA

The drainage in a coal mine under exploitation may give a strong impact on the underground water flow regime, causing negative influence on the development of the groundwater resources. The shallow subsurface water beneath Shenfu mining area not only serves as the main source of water supply but also is used as the water source for maintaining the whole area's ecosystem. The present paper is just aimed at exploring the influence extent of the shallow subsurface water on the underground water regime resulted from the coal mining. Taking the unconfined aquifer overlying the coal formation as the target, we have made a numerical simulation to test the response of the groundwater flow to the mine drainage by postulating the groundwater flow in two dimensional bilateral flow. The changes of the flow regime induced by the mining activities are simulated and predicted after the parameter identification and the model test are finished with the finite unit element method. The results of our test suggest that the aquifer tends to be depleted with the further extension of the mining area and increase of mining drainage. But the underground water flowing chart shows that the decline rate will be higher in the high permeable aquifer area than that in the lower one. In addition, water springs will eventually vanish, which may lead to the groundwater shortage. So, in order to make the development of this area sustainable, it is necessary to choose the optimal strategy of coal mining in hope to avoid the ruin of the aquifer bottom.