为研究马镇研究区渗流井取水效果,采用地质雷达和钻孔相结合的方法揭示研究区地层,建立三维地层结构模型。对研究区合理概化,建立地下水数值模型,并利用渗流井抽水试验对模型识别和验证,确定出水文地质参数。对模型参数进行灵敏度分析,结果表明:第四系水平渗透系数对渗流井取水效果影响最大,河流渗漏补给系数C1值对渗流井出水量影响最小;对渗流井结构进行优化设计,得出辐射管仰角为20°～30°,洞室间距应设置在75～100 m之间时,渗流井取水效果较好。研究成果可为渗流井取水方式的广泛应用和提高取水效率提供指导。
Abstract
A 3D hydrological and stratigraphic structure model was built based on strata revealed by geological radar and drilling data to probe into the efficiency of water yield of seepage wells in Mazhen county. The model was identified and verified by pumping test of seepage well and the hydrogeological parameters were determined. Sensitivity analysis of the model parameters unveiled that the horizontal permeability coefficient of the quaternary strata had the greatest influence on the water intake effect of seepage well, while the value of recharge C1 of river had the least influence on the water intake of seepage well. Moreover, optimization design of the seepage well structure evinced that the angle of altitude of radiant tubes between 20° and 30° and spacing of chambers between 75 m and 100 m will result in a good efficiency of water intake by seepage well.
关键词
渗流井 /
取水效率 /
渗流-管流耦合模型 /
灵敏度分析 /
辐射管仰角 /
洞室间距
Key words
seepage well /
water intake efficiency /
coupled seepage-pipe flow model /
sensitivity analysis /
angle of altitude of radiant tubes /
chamber spacing
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基金
陕西省地矿总公司地质科研专项资金项目(KY201503);国家自然科学基金项目(40972154)
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