二亩沟煤矿开采降压疏水对洪山泉影响的数值模拟研究

摘要

In this paper, analysis was made on the geological and hydro-geological conditions of Hongshan spring and mine field by taking Pingyao Ermugou Mine as an example, since the pressure reduction measure by water drainage was taken in the pressure zone of No. 11 coal seam, the conceptual and mathematical models of hydro-geology were established with Visual Modflow software and prediction was carried out on its influence upon the karst groundwater of Hongshan spring. The research results showed that when a water drainage pressure-reduction well was arranged in the eastern area of the mine field where the water inrush coefficient was in the range of 0. 06-0. 07 MPa/m, the maximum water level drawdown in the simulated area was about 54 m, the influence radius was about 2 056. 77 m and the affecting area was about 13. 29 km2 after water drainage for 110 d, this indicated that the pressure reduction by water drainage would affect the karst groundwater environment of Hongshan spring, which can provide basis for the coal mining and water resources protection.%以平遥二亩沟煤矿为例,分析了洪山泉域和井田的地质及水文地质条件,考虑对11号煤层带压区采取降压疏水措施,应用Visual Modflow软件建立水文地质概念模型和数学模型,预测其对洪山泉岩溶地下水的影响。研究结果显示,在井田开采突水系数为0．06~0．07 MPa/m的井田中东部地段布设1口疏水降压井,排水110 d后,模拟区最大水位降深约54 m,影响半径约2056．77 m,影响面积约13．29 km2,表明降压疏水会对洪山泉域岩溶地下水环境产生影响,可为煤矿开采与地下水资源的保护提供依据。