白云鄂博西矿露天采场地下水赋存特征及涌水量预测

Study on the Occurrence Characteristics of Groundwater and the Prediction of Water Inflow in the Open-pit of Bayan Obo West Mine

矿山开采很大程度上受制于地下水的发育程度,富水岩体的边坡稳定性对矿山的安全生产具有一定影响。以白云鄂博西矿为例,通过对采场地下水出露情况、观测孔地下水位动态情况及爆区炮孔水位信息统计分析,基于SURPAC软件数据库构建模型,以矿山的地质报告为基础,对矿山的地下水分布实现了三维可视化。利用Visual Modflow软件的PEST模块对采场各含水层的水文地质参数进行优化校准,对矿山的涌水量情况进行了预测;通过布置抽水井,预测开采至1 400 m标高时,矿坑涌水量约为4 298.4 m^(3)/d,为地下水治理方案提供依据。

Mining is largely restricted by the development of groundwater,and the slope stability of water-rich rock mass has a certain influence on the safety of mine production.Taking Bayan Obo West Mine as an example,through the statistical analysis of the underground water emergence of the stope,the dynam⁃ic situation of the groundwater level of the observation hole and the information of the water level of the shot hole in the explosion area,the model is built based on the SURPAC software database and the geological re⁃port of the mine is used as the basis to realize the three-dimensional visualization of the underground water distribution of the mine.PEST module of Visual Modflow software is used to optimize and calibrate the hy⁃drogeological parameters of each aquifer in stope,and the water inflow of mine is predicted.By arranging pumping wells,it is predicted that the mine water inflow will be about 4298.4 m3/d when mining to 1400 m elevation,which provides a basis for groundwater treatment plan.