江汉平原典型含水层水文地质参数反演

发布时间：2018-07-12 09:07

本文选题：抽水试验 + 压水试验　；参考：《地球科学》2017年05期

【摘要】：含水层参数对于定性分析区域地下水资源评价、数值模拟及预报、开发利用与保护及科学管理具有重要意义,而江汉平原水文地质参数求解的研究却相对较少.2015年江汉平原1∶50 000水文地质调查项目完成杨林尾图幅与陆溪口图幅,选择杨林尾图幅和陆溪口图幅中的4个代表性钻孔,分别做了3组抽水试验和一组压水试验.对抽水数据使用Dupuit公式法结合抽水稳定阶段数据求解含水层参数,同时利用Aquifer Test软件中Theis标准曲线法、直线图解法对抽水试验中非稳定条件下抽水数据对含水层参数求解,得到孔隙水含水层渗透系数及弹性给水度;利用压水试验工程规范求解基岩裂隙含水层的渗透系数.探讨了利用非稳定抽水试验条件下求解含水层参数方法的可行性及该方法的优势.计算结果表明:杨林尾镇浅层(20.264.55m)含水层渗透系数为0.075m/d,弹性给水度为5.8×10~(-2);深层(138160m)含水层渗透系数为9.89m/d,弹性给水度为2.3×10~(-5);陆溪口镇浅层(19.436.4m)含水层渗透系数1.26m/d,弹性给水度为1.1×10~(-1);基岩渗透系数为0.012m/d.通过结果对比分析发现对于单孔非稳定抽水试验,对前期水位降深数据筛选分析,同样可以利用非稳定井流理论反演含水层参数,结果比较可靠.
[Abstract]:Aquifer parameters are of great significance for qualitative analysis of regional groundwater resources evaluation, numerical simulation and prediction, development, utilization, protection and scientific management. In 2015, the 1:50 hydrogeological survey project of Jianghan Plain completed Yang Lin tail map and Luxikou map, and selected four representative boreholes from Yang Lin tail map and Luxikou map. Three groups of pumping tests and one group of water pressure tests were conducted. Dupuit formula method combined with pumping steady stage data is used to solve aquifer parameters, and Theis standard curve method in Aquifer Test software and straight line diagram method are used to solve the parameters of aquifer under unsteady condition of pumping test. The permeability coefficient and elastic water supply of pore water aquifer are obtained, and the permeability coefficient of fractured aquifer in bedrock is solved by using the engineering code of pressurized water test. The feasibility and advantages of the method for solving aquifer parameters under unsteady pumping test are discussed. The results show that the permeability coefficient of shallow (20.264.55 m) aquifer is 0.075 m / d, the elastic water supply is 5.8 脳 10 ~ (-2), the permeability coefficient of deep (138160 m) aquifer is 9.89 m / d, the elastic water supply is 2.3 脳 10 ~ (-5), the permeability coefficient of shallow layer (19.436.4 m) aquifer is 1.26 md, and the elastic feed degree is 1.26 mm / d. The permeability coefficient of bedrock is 0.012 m / d. By comparing the results, it is found that the unsteady pumping test with single hole and the screening analysis of the pre-stage water level drop data can also be used to retrieve the aquifer parameters by using the unsteady well flow theory, and the results are relatively reliable.
【作者单位】：中国地质大学环境学院;
【基金】：国家自然科学基金项目(No.41372253) 中国地质调查局项目(Nos.12120114069301,DD20160255) 中央高校基本科研业务费专项基金项目(No.CUG140503)
【分类号】：P641.6

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