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某矿区的主要补给水源为大气降水,将矿区水文地质系统概化为三维降雨入渗模型,利用FEFLOW构建矿区地下水流入渗分析模型,模拟2%暴雨频率条件下,露天矿坑汇积水入渗至地下采场的水流动态过程,探讨2%暴雨频率下持续降水时长对井下涌水量的影响,分析露天转地下覆盖层的涵水作用和滞水作用,研究覆盖层的滞水时长及其影响因素。数值分析结果表明,若无露天转地下覆盖层的迟滞水作用,2%暴雨频率下的井下涌水将远大于矿山设计排水能力;而在适当结构的露天转地下覆盖层的涵水和滞水作用下,设计排水能力将满足排水安全要求,覆盖层滞水时间大于10h。
The main recharge water source in a mining area is atmospheric precipitation, and the mining hydrogeology system is generalized to three-dimensional rainfall infiltration model. The groundwater infiltration analysis model is constructed by using FEFLOW. Under the condition of 2% rainfall frequency, The dynamic process of water flow in underground stope, the effect of continuous rainfall duration at 2% rainstorm frequency on downhole water inflow was analyzed, and the effect of water diversion and water stagnation on the overburden from open transiting to open ground were analyzed. The duration of water stagnation and its influencing factors . The results of numerical analysis show that the underground gushing water under the 2% heavy rainfall frequency will be far greater than the designed drainage capacity of the mine without the action of the stagnant water in the open-air transition to the underground cover. However, Under the design of drainage capacity will meet the drainage safety requirements, the cover water stagnation time is greater than 10h.