基于Visual Modflow的刚果(金)迪兹瓦露天矿地下涌水量预测

Prediction of Underground Water Inflow in Deziwa Open-pit Mine in the Democratic Republic of Congo(DRC)Based on Visual Modflow

在露天矿山实际开采过程中,准确预测各阶段涌水量对矿山安全生产具有重要意义。以刚果(金)迪兹瓦露天矿为中心建立研究区,采用Visual Modflow数值模拟软件对研究区的边界条件和水文地质条件进行刻画,模拟矿区及周围环境的地下水流场分布。模型预测结果显示:所建模型可较好的模拟研究区地下水流场分布,矿区开采第3年、第6年、第10年的平均涌水量分别为12100、13400、14400 m 3/d。同时,地下涌水量随季节降雨量的变动而发生变化,丰水期涌水量约为平水期的1.5倍,约为枯水期的2倍。通过对矿区各阶段涌水量进行定量分析,可为矿区防排水设计提供了一定的科学依据。

In the actual mining process of open-pit mine,accurate prediction of water inflow at each stage is of great significance to mine safety production.The Deziwa open-pit mine in the Democratic Republic of Congo(DRC)was taken as the center to establish the study area.Visual Modflow numerical simulation software was used to describe the boundary conditions and hydrogeological conditions of the study area,the distribution of underground water flow field in the mining area and the surrounding environment was simulated.The prediction results show that the established model can better simulate the distribution of groundwater flow field in the study area,and the average water inflow in the third,sixth and tenth years of mining is 12100,13400,14400 m 3/d,respectively.At the same time,the groundwater inflow changes with the seasonal rainfall.The water inflow in wet season is about 1.5 times that in normal season,and about 2 times that in dry season.The quantitative analysis of the water inflow in each stage of the mining area can provide a certain scientific basis for the design of drainage in the mining area.