MODFLOW在三门峡铝土矿疏干排水模拟中的应用

Application of MODFLOW in Groundwater Drainage Numerical Simulation in Sanmenxia Bauxite

摘要:

根据三门峡铝土矿区地层分布、地质构造及水文地质条件，对矿区赋水的寒武—奥陶系灰岩岩溶裂隙含水系统水文地质条件进行概化，建立了地下水流数学模型，采用Visual MODFLOW有限差分方法模拟地下水位变化和预测涌水量。结合矿区群井抽水试验地下水位观测资料对地下水流数学模型进行校正和参数反演，利用校正后的数学模型和参数预测井在不同采矿设计疏干水平下地下水的水位分布和矿区涌水量的变化，为有效防治地下水和安全合理开采铝土矿提供可靠的依据。

关键词:铝土矿;疏干排水;模拟;涌水量;MODFLOW;三门峡

Abstract:

Base on the stratigraphic distribution, the geologic structure and hydrogeologic conditions of Sanmenxia bauxite, the hydrogeologic conceptual model of karst-fracture aquifer system of water enrichment Cambrian-Ordovirian Period limestone was generalized, and the numerical model of groundwater flow was established using finite difference method of Visual Modflow to simulate variation of groundwater level and to predict water discharging, which the groundwater flow mathematical model was corrected and the hydrogeolocical parameters were inversed combining with observation value of groundwater level of group drilling pumping tests in mining area boreholes, and then utilizing the corrected mathematical model and parameters to predict the groundwater level distribution and mine discharge changes at different designed mining drainage level in well. The reliable basis is provided for controlling groundwater effectively and safe rational mining bauxite.

Key words:bauxite; groundwater drainage; simulation; discharge; MODFLOW; Sanmenxia