基于GIS与层次分析法的煤层顶板含水层富水性评价

Water Abundance Evaluation of Aquifer of Coal Seam Roof Based on GIS and Analytic Hierarchy Process

煤层开采后,顶板处受影响的含水层地下水将对矿井进行充水。含水层的富水性是决定煤矿是否存在突水危险的重要基础,富水性评价工作对保障煤矿安全生产具有重要意义。首先对影响同宝煤矿15号煤层顶板含水层富水性的影响因素进行了分析,确定了灰岩厚度、岩芯采取率、脆塑岩厚度比、冲洗液消耗量4个影响因素,并对各因素进行了归一化处理;然后利用层次分析法计算了各因素的权重,并结合GIS建立了富水性评价模型,对含水层富水性进行了评价;最后与现场物探结果进行了对比验证。结果显示,评价结果具有较好的精度,对指导煤矿安全生产具有重要意义。

After mining,the mine will be filled with groundwater from the affected aquifer at the roof.The water abundance of the aquifer is an important basis for the risk determination of water inrush,so the water abundance evaluation is of great significance to ensure the safety production in the coal mines.Firstly,on the analysis of the water abundance of the roof aquifer of No.15 coal seam in Tongbao Coal Mine,four factors,including limestone thickness,core recovery rate,brittle-plastic rock thickness ratio,and flushing fluid consumption,were determined and normalized;then,the weight of each factor was calculated by Analytic Hierarchy Process(AHP)and a water abundance evaluation model was established by GIS;finally,it was verified in comparison with the on-site geophysical results.The results show that the evaluation presents a good precision,which is of great significance for the safe production in the coal mines.