浅埋薄基岩煤层开采对潜水含水层的影响及定量评价

为研究干旱矿区浅埋薄基岩煤层开采对潜水含水层的影响程度,选择凉水井煤矿为研究对象,在资料收集、野外调查、室内测试的基础上,采用数值模拟的手段分析潜水含水层对煤层开采的响应规律。研究结果表明:研究区风积沙降水入渗系数高达0.53,降水是地下水补给的主要来源(约95%),地下水总量受大气降水控制明显;开采前地下水向河流的排泄约占78%,蒸发排泄约占22%;受采掘矿井水排泄量(34.09%)影响,河流与蒸发排泄量占比分别减少至53.07%和12.84%;利用潜水含水层地下水漏失量Ql与开采前地下水排泄总量Qd的比值来表征地下水量的扰动程度Eq(Eq=Ql/Qd),扰动程度高达27%。

Influence of coal mining with shallow buried and thin bedrock on unconfind aquifer and quantitative evaluation

Taking Liangshuijing Coal Mine as the research object,data collection,field investigation,laboratory test and numerical simulation were used to numerically simulate the response law of unconfind aquifer to coal mining in order to study the influence of coal mining with shallow buried and thin bedrock on unconfind aquifer.The results show that the precipitation infiltration coefficient of aeolian sand in the study area is as high as 0.53.Groundwater recharge mainly comes from infiltration of precipitation,accounting for about 95%,therefore the total amount of groundwater is obviously controlled by atmospheric precipitation.Before mining,about 78%of groundwater is drained to rivers,and the remaining 22%is lost by evaporation.Affected by the water yield of mine(34.09%),the proportion of drainage of the rivers and evaporation is decreased to 53.07%and 12.84%,respectively.It is proposed to use the ratio of the groundwater leakage of unconfind aquifer(Ql)and the total groundwater discharge before mining(Qd)to characterize the disturbance degree of groundwater(Eq)(Eq=Ql/Qd),which was as high as 27%.