露天煤矿开采后地下水疏干范围研究

Opencast Coal Mine Drainage of the Groundwater Exploitation Research Scope

将梁家碛露天煤矿开采后对地下水的影响概化为奥陶系中统灰岩岩溶裂隙含水层,石炭—二叠系碎屑岩裂隙含水层,第三系、第四系松散孔隙含水层,研究梁家碛露天煤矿开采后地下水疏干范围。其中,首采区、二采区奥陶系岩溶水突水系数小于受构造破坏地段突水系数的临界值(0.06 MPa/m),不会造成突水事故,也不会破坏该层含水层。采用塞罗瓦特科公式和无观测孔完整井抽水状态下的影响半径公式分别讨论了煤炭开采后对第三系、第四系松散孔隙含水层,石炭—二叠系碎屑岩裂隙含水层地下水的疏干范围,结果表明,其影响半径分别为5 864.12、4 895.50 m。

The groundwater drainage range after Liangjiaqi opencast coal mining was researched via generalizing the effects of Liangjiaqi opencast coal mining on groundwater to middle Ordovician limestone karstic fissure water aquifer, the Carboniferous Permian elastic rock fissure, water aquifer, third lines and the Quaternary loose pore aquifers. Among them, the inrush coefficient of Ordovician karstic water in first and second mining area were both less than the critical value （0.06 MPa/m）, the structural damaged sections of water inrush coefficient, which would not cause the water inrush acci- dent, and damage the aquifer. Using the Sello Watt C formula and the effect radius fornmla under the conditions of complete well pumping without ob- servation hole the groundwater drainage area of the Quaternary loose pore aquifers, Carboniferous-Permian elastic rock fissure aquifer and the coal mining on third lines were discussed. The results show that the influence of radius respectively is 5 864.12 and 4 895.50 m respectively.