三维渗流模型在李楼铁矿矿坑涌水量预测中的应用

The application of the three dimensional seepage model in the prediction of water yield of mine

李楼铁矿赋存于新太古界霍邱群周集组片岩、片麻岩及白云石大理岩中,矿体及围岩构造裂隙带,为矿床水的储存与运移通道;矿体上覆周集组风化裂隙含水层、青白口系风化裂隙含水层与第四系孔隙含水层,构成一个分布范围大、厚度大、透水性较差、富水性较弱含水体,为矿坑水的充水来源。矿山开采于深部-200m疏干排水时,地下水向排水点汇聚,第四系底部薄含水层承压水压力迅速释放并向四周扩展,上覆第四系孔隙水越流补给,垂向上存在地下水水头梯度,地下水流场呈现三维空间流场。文章在上述水文地质条件认识的基础上,利用地下水三维观测系统取得的长期动态观测资料和放水试验资料,建立三维流数学模型预测矿坑涌水量,并提出了矿山防治水建议,指导矿山建设。

Lilou iron ore, deposited in Ar4 z schist of new Archeozoic, gneiss, dolomite marble, ore body, and the jointed zone of wall rock, serves as the passage for the storage and transmitting of mine water; Ore body covered with Qnl weathered aquifers, Ar4z weathered, jointed aquifer and quaternary aquifer composes aquifer features widely spread, low water permeability and weak water yielding serving as the water resources of mining pit. When draining is being performed at the depth of 200 m where is mined, ground- water gathers toward the draining zone, pressure above - the confining water in the thin aquifer at the bottom of quaternary, is released rapidly and expanding around; above quaternary pore water leakage - recharges under the vertical pressure created by the existed grads. The groundwater takes on a three - dimensional flow field. Based on the above mentioned point of view, this article establishes three - dimensional flow mathematic model for predicting water yield of mining pit, and puts forward advices and proposals on mine water control so as to guide the construction of mines using discharging test data and the long - term - observed dynamic data acquired through groundwater three - dimensional observation system.