淮北采煤塌陷蓄水区地下水流场分布特征分析

为了解淮北采煤塌陷蓄水区地下水分布规律，在充分收集研究区已有相关成果资料的基础上，从研究采煤塌陷区域含水层结构变异入手，运用Visual Modflow软件对研究区地下水流场变化特征进行模拟、分析。结果表明：1）煤层完全开采情况下矿坑不再排水，因采煤矿坑排水而下降的松散层孔隙水水位在降雨补给和河流补给的作用下将逐渐回升，但基本无法恢复至采前水平；2）裂隙岩溶水接受塌陷区湖泊地表水和松散层孔隙水通过垂向网络型导水裂隙带不断入渗补给，导致研究区域裂隙岩溶水水位上升和溢出而形成多个局部水丘。闭坑后采煤塌陷蓄水区地下水流场分布规律研究成果可以为类似采煤塌陷蓄水区地下水资源综合利用提供参考。

Analysis on distribution characteristics of underground flow field in the subsidence reserboir of Huaibei coal mining

In order to research on the distribution law of groundwater in Huaibei coal mining collapse storage area, based on the collecting sufficiently of relevant literatures and date in the research area, Visual Modflow software was used to simulate and analyze the variation characteristics of groundwater flow field in coal mining collapse storage area from the perspective of studying the variation of aquifer structure. The results showed that: 1) when the coal seam is completely mined, the mine will no longer drain, and the porewater level of the loose layer that is drained due to the drainage of the coal mining pit will gradually rise under the condition of rainfall recharge and river recharge, but it can not recover to the pre-mining level. 2) The drop of groundwater level caused by mine drainage cannot be restored to the initial pre-mining flow field under natural conditions, but a subsidence lake is formed in the collapsed area, and the fissure karst water receives continuous infiltration and recharge of lake surface water in the subsidence area and porewater in the loose layer through the vertical network water-conducting fracture zone. The rise and overflow of fissure karst water level in each collapsed storage area resulted in the formation of several local water mounds. The study on the distribution of groundwater flow field in coal mining collapse storage area after pit closure can provide scientific basis for the comprehensive utilization of groundwater resources in coal mining collapse storage area.