基于排水沟数值模型的工作面涌水量预测

Prediction of Water Inflow from Working Face Based on Numerical Model of Drainage Ditch

采煤工作面的涌水量预测是煤矿生产过程中防治水工作开展的基础。通过对煤矿采空区水文地质条件概化研究,结合地下水数值模拟软件Visual MODFLOW中各类源汇项的水文地质模型的分析,提出采空区涌水在数值模拟过程中需将其概化为具有面状排水特征的排水沟边界条件,利用面状排水沟边界和局部水均衡分析,可计算得出工作面回采后采空区涌水量。利用本研究得出的采空区概化方法,对黄陇煤田亭南煤矿303工作面进行涌水量数值模拟预测,结果表明其方法合理可靠,流场刻画和水量预测结果均优于以往采用群孔抽水井的概化模型。

The prediction of water inflow from coal mining face is the basis for the prevention and control of water in the production process of coal mines.Through the generalization of hydro-geological conditions in coal mine goaf,combined with the analysis of hydro-geological models of various sources and sink items in groundwater numerical simulation software Visual MODFLOW,it is proposed that the water gushing in goaf should be generalized into the boundary conditions of the drainage ditch with the characteristics of planar drainage in the process of numerical simulation.Using the boundary of the drainage ditch and the analysis of the local water balance,the amount of water in the goaf after the mining of the working face can be calculated.Based on the generalized method of goaf in this study,the numerical simulation of water inflow in 303 working face of Tingnan Coal Mine in Huanglong Coalfield is carried out.The results show that the method is reasonable and reliable,and the flow field characterization and water prediction results are better than that from the model of a hole pumping well.