徐州东部废弃矿井地下水流场演化模拟研究

发布时间：2018-09-18 12:16

【摘要】：以徐州东部废弃矿井为例,太原组灰岩含水层为研究对象,通过建立废弃矿井地区地下水流系统模型,运用数值模拟技术对区域地下水流场演变过程进行研究,揭示矿井废弃地区地下水流场演化的一般规律为:煤矿关闭前,为满足生产生活需要,矿井进行大量排水、抽水工作,矿区形成若干降落漏斗,如位于矿区西部的青山泉煤矿和北部的韩桥煤矿内均存在大面积降落漏斗,中心水位低于-25 m。受水力梯度影响,地下水向低洼的矿坑处汇集,原生地下水流系统遭到破坏。矿井闭坑后,原有排水系统全部停止工作,地下水位缓慢回升,降落漏斗逐渐减小,根据模型模拟结果,发现水位回升速度随矿井关闭时间的增加而减慢:在矿井关闭第1年内,水位回升速度较大,为1.14 m/a;关闭第3年时,水位回升速度减少至0.165 m/a;矿井关闭10年时,地下水最高水位为-16.55 m,从关闭第3年至第10年的7年时间内,水位回升速度仅0.039 m/a,矿区地下水流系统得到恢复,模拟区最终形成自北向南的近似稳定的地下水径流场。
[Abstract]:Taking the abandoned coal mine in the eastern part of Xuzhou as an example and the limestone aquifer of Taiyuan formation as the research object, the evolution process of regional groundwater flow field is studied by establishing the groundwater flow system model in the abandoned mine area and using numerical simulation technology. It is revealed that the general law of the evolution of underground water flow field in the abandoned area of mine is that before the coal mine is closed, in order to meet the needs of production and daily life, a large amount of drainage and pumping work are carried out in the mine, and a number of falling funnels are formed in the For example, in Qingshanquan Coal Mine in the west of mining area and Hanqiao Coal Mine in the north, there is a large area of falling funnel, and the central water level is lower than -25 m. Under the influence of hydraulic gradient, groundwater accumulates into low-lying pits and the primary groundwater flow system is destroyed. After the pit is closed, the original drainage system stops working, the groundwater level rises slowly, and the drop funnel decreases gradually. According to the simulation results of the model, It was found that the recovery rate of water level slowed down with the increase of mine closing time: in the first year of mine closure, the rate of water level rising was 1.14 m / a; in the third year of closure, the recovery rate of water level decreased to 0.165 m / a; when the mine was closed for 10 years, the recovery rate of water level decreased to 0.165 m / a. The maximum groundwater level is -16.55 m. In the 7 years from the third year to the tenth year, the recovery rate of the groundwater level is only 0.039 m / a. The groundwater flow system in the mining area is restored, and the simulated area forms an approximately stable groundwater runoff field from north to south.
【作者单位】：南京大学地球科学与工程学院;中国矿业大学资源与地球科学学院;
【基金】：地下水流数值模拟概念模型的不确定性分析(41302181) 水利部科技推广计划项目“徐州矿井废水综合生态治理示范技术”(TG1517) 江苏省水利科技项目“徐州矿井水综合生态治理技术及开发利用模式研究与应用”(2014052)
【分类号】：P641.2

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