煤矿开采对红碱淖补给量的影响研究

Study on Influence of Coal Mining in Mataihao Mines on the Recharge Amount of Hongjiannao Lake

摘要: 马泰壕煤矿距离红碱淖最近短距离2km，正确评价其开采对红碱淖补给量的影响，成为合理开发利用煤炭资源过程中急需解决的问题。在区域及井田地质水文地质调查基础上，运用概率积分模型进行地表变形预测，并根据“三下”规程进行导水裂缝带发育高度计算结果。分析煤矿开采对红碱淖地表、地下产汇流及其含水系统的影响。研究表明：全井田开采后，大的地形趋势没有发生变化，大部分地表水及潜水仍向红碱淖方向汇流，局部因采煤沉陷导致河道水力坡度变化和潜水位埋深变浅，甚至出露。最大减少向红碱淖补给的地表水量只占其天然地表径流量的1.47%。在直罗组稳定隔水层阻隔下，煤矿开采不会对红碱淖含水层中的水造成直接影响。

Abstract: The shortest distance between the Mataihao coal mining and the Hongjiannao coal mining is 2 km. The correct evaluation of the Mataihao coal mining on the recharge amount of Hongjiannao Lake is one of the urgent problems which need to be solved during the course of the rational development and utilization of coal resources. According to regional and mine field geological, hydrogeology survey, this paper predicts the ground deformation by use of probability integral model, calculates the water flowing fractured zone height by the formula and calculating the development height of water conducting fracture zone based on "Three Lowers" regulation. The influence of the coal mining subsidence on Hongjiannao surface, underground runoff and the groundwater system is analyzed. Research shows that: without major changes of the terrain after the whole mine field exploitation, the surface water and phreatic water continued to hold its majority flow concentration trend and hydraulic gradient changes or phreatic water exposed in a local area. The maximum reduction in surface water replenishment to Hongjiannao only accounts for 1.47% of its natural surface runoff. Coal mining doesn’t directly affect the Hongjiannao aquifers because of stable aquifuges in Jurassic Zhiluo formation.