典型煤矿关闭后地下水富集区域预测研究

Study on prediction of groundwater enrichment region after closure of typical coal mines

典型国有大型煤矿开采过程中形成一定规模的地下水存储空间,在重庆市关闭煤矿的大环境下,研究煤矿关闭后地下水的分布范围对矿区生态环境具有现实意义。为分析煤矿关闭后可能形成富水区域,对鱼田堡煤矿进行数值模拟分析,研究结果表明在矿井闭坑后形成三个富水区域:煤层覆岩P_(3)c灰岩区域富水性好,排水系统撤掉后,该区域地下水位逐渐上升;采动范围内T_(1)j^(1)段灰岩浅部富水区域可储存大量地下水;采动范围内T_(1)f^(1+5)水性不如前面两者,但是由于表层地表裂缝增大储水空间,具有一定的富水性。

A certain scale of groundwater storage space is formed in the mining process of typical large state-owned coal.Under the circumstances of coal mine closure in Chongqing,study on distribution range of groundwater after coal mines has practical significances on the ecological environment of mining areas.In order to analyze groundwater enrichment region which may be formed after coal mine closure,numerical simulation analysis is conducted in Yutianbao coal mine.The results show that three water enrichment regions are formed after mine closure.The limestone region of coal seam P3 c is rich in water,after withdrawal of drainage system,groundwater level gradually increases;Water-rich region of limestone shallow area in T_(1)j^(1) section within the mining range can store a large amount of groundwater;Water richness in T_(1)f^(1+5) section is not as good as the former two,but it has a certain amount of water because surface fracture increases water storage space.