复杂岩溶矿床延深水平涌水量的预测

随着岩溶矿床的延深开采,矿坑涌水量的计算成为防治水害首先要解决的难题。文章创造性地采用国外广泛采用的岩溶水衰减动态分析法,选择了我国南方复杂岩溶含水层中有代表性的重庆市红岩煤矿,将丛林采区茅口组岩溶水动力单元和该单元南大巷(标高+370 m)的茅口灰岩岩溶含水层的主要排水点-1号突水点作为研究对象,建立了该单元岩溶含水层的计算模型-衰减动态(流量和水位)方程,求出了岩溶水动力单元水均衡、地下水储量计算和矿坑涌水量预测的水文地质参数:a、T、K、S、μ、Ie,建立了该单元岩溶裂隙-管道水的水均衡方程, 根据连续观察一个水文年以上的丰富地下水动态资料,预测了红岩煤矿370 m标高以下的延伸开采水平(295- 370 m)矿坑涌水量。

PREDICTION OF THE MINE INFLOW TO THE EXPLOITED LOWER LEVEL IN A COMPLICATED KARST MINERAL DEPOSIT

As karst mineral deposit is about to be exploited deeper, a difficult problem to be solved for first for prevention from the disaster caused by karst water protrusion is calculation of mine inflow by creatively introducing the method of analyzing karst water regime during recession adopted extensively abroad, choosing the karst hydrodynamic unit of the Maokou Formation in the Conglin exploitative zone, Chongqing Hongyan colliery and the main water-welling point No. 1 of karst aquifer of Maokou limestone in the south gallery (at 370m above the sea level) within the zone as the objects to be studied this paper has established a model for calculation i. e. the regime equations of discharge and water level during recession of Karst aquifer in the u-nit, found several hydrogeological parameters: exhaustion, a, transmissibility, T, permeability, K, storage coefficient, S, specific yield,μ, and coefficient of effective infiltration, Ie, derived a equation of water balance of Karst fissure-conduit type flow in the unit and finally predicted mine inflow to the exploited lower level at the depth below 370m above the sea level, Hongyan colliery based on a lot of data of underground water regime progressively observed for three hydrologic years or more.