基于地下水流数值模型的灰岩含水层疏放可行性研究

Study on feasibility of limestone aquifer draining based on numerical model of subsurface flow

为了查清灰岩含水层水文地质条件,分析该含水层的疏干可行性,采用了三维地震、瞬变电磁法物探探查、水文地质钻探探查、水文地球化学探查及井上(下)群孔三降深大型抽(放)水试验等综合探查手段。基于放水试验资料,建立了矿井水文地质模型,利用Feflow数值模拟软件对水文地质模型进行了参数识别和验证,分析了大青灰岩含水层疏干可行性。结果表明,大青灰岩含水层与下伏富水性极强的奥陶系灰岩含水层水力联系密切,水文地质条件复杂,大青灰岩的疏干工作应建立在封堵大青灰岩与奥灰间导水通道基础上。

In order to detect the hydrogeological conditions and analyze the draining feasibility of limestone aquifer,the comprehensive exploration method was applied,including 3D seismic exploration,transient electromagnetics,hydrogeological drilling,hydrogeochemistry and large dewatering and pumping test etc. In addition,based on the data observed in dewatering and pumping test,a numerical model was built to forecast draining water quantity and analyze draining feasibility. The results showed that there is close hydraulic connection between Daqing limestone aquifer and Ordovician limestone aquifer,and the water channel between them should be blocked off before draining Daqing limestone aquifer.