露天开采过程将对地下水循环系统造成影响,目前这方面的定量研究却较少报告。结合四川某铁矿露天开采区水文地质条件,采用Visual Modflow 建立矿区地下水水流模型,分别预测开采至不同标高处的地下水流场变化、地下水涌水量及降落漏斗影响面积。预测结果表明,在露天矿坑周围局部地区地下水流指向开采区域,随着开采年限增长,地下水降落漏斗影响面积从0．54 km2增至1．55 km2,涌水量为3220~4565 m3/d,并揭示出地下水涌水量随季节的变化趋势。通过模型预测的定量评价,为矿山疏干采矿及设计防治水方案提供了一定科学依据。%The process of open cut mining has an impact on the groundwater flow system, while few study reports the quantitative impact at present. In this study,a groundwater flow model in the Visual Modflow is built based on the hydrogeologi-cal conditions of an open-cut iron mining site in Sichuan. Then,the calibrated flow model was used to predict the distribution of groundwater flow,groundwater inflow rate and cone of groundwater drawdown at different mining elevations. The results showed that the groundwater flowed to the open pit locally. With the progress of mining lasting,the area of the groundwater drawdown increased from 0. 54 km2 to 1. 55 km2 and the groundwater inflow rate was 3 220~4 565 m3/d. The variation of groundwater inflow rate with seasons is revealed. The quantitative analysis by model predictions could provide a scientific support on the de-sign of mining drainage and water control.
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