Shaanxi Xiaobaodang Mining Co., Ltd.
College of Geology and Environment, Xi’ an University of Science and Technology

在煤炭开采影响下地下水系统的补径排条件势必发生变化,导致区域地下水动力循环特征复杂化,分析确定采煤引起的地下水位变幅及漏失量是探究煤矿开采-地下水-生态环境互馈响应机制的关键。以榆神矿区小保当井田为例,采用MODFLOW建立区域地下水流数值模型,并通过长观孔水位动态监测资料对模型进行识别和验证,预测分析煤炭开采影响下第四系及侏罗系风化基岩含水层水位及水量的变化规律。模拟结果表明,采煤影响下第四系水位和侏罗系风化基岩含水层水位出现不同程度下降,但幅度较小,小保当二号井开采10a末潜水最大水位降深1.01m,潜水漏失量约为54.4万m3/a,占矿井涌水量的23%,风化基岩水位降深0.2~4.03m。该结果可为煤矿开采对地下水影响的研究及矿区生态环境保护提供借鉴。

Coal mining has an influence on the supplement, route and discharge of the underground water system, causing thecomplex of dynamic recycle characteristics of regional underground water. Analysis of the coal mining-induced change ingroundwater level and its leakage amount is the key to explore the response mechanism of the groundwater, mining activityand ecological environment. We take Xiaobaodang mining area as an example, a numerical simulation model of groundwaterflow was established by employing the Visual MODFLOW, and the change law of groundwater level and water quantity inQuaternary water level and Jurassic weathered aquifer were predicted using the validated model. The simulation results indicated that under the influence of coal mining, the groundwater level declined in both Quaternary water level and Jurassicweathered aquifer with small fluctuation. The maximum decrease of groundwater level in phreatic aquifer was 1. 01 m, causing the groundwater loss of 54. 4 × 10 m3 / a, which accounted for 23% of the amount of gushing water in the mining area.The decrease in weathered aquifer ranged from 0. 2 to 4. 03 m. The study provides references for the research of affect ofcoal mining on groundwater and the protection of regional ecological environment.

榆北煤业科研项目(2021YBKJ-04);陕煤联合基金项目(2021JLM-09);陕西省科技厅中央引导地方科技发展专项资金计划项目(2020ZY-JC-03)