| 武汉长江Ⅰ级阶地含水层水文地质参数研究及工程应用 |
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| 引用本文： | 徐杨青,刘国锋,吴西臣.武汉长江Ⅰ级阶地含水层水文地质参数研究及工程应用[J].岩土力学,2016,37(10):2915-2920. |
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| 作者姓名： | 徐杨青 刘国锋 吴西臣 |
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| 作者单位： | 中煤科工集团武汉设计研究院有限公司，湖北 武汉，430064 |
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| 摘 要： | 武汉地区长江Ⅰ级阶地含水层在水流等沉积动力的分选作用和上覆土层压力的固结作用下，其渗透系数必然存在各向异性。因此，基于含水层渗透系数的各向同性和以单井稳定流抽水试验得到的含水层水文地质参数所完成的基坑降水设计亦必然与工程实际存在差异。通过现场分层抽水试验、群井抽水试验，结合三维数值模拟反演计算，得出了武汉长江Ⅰ级阶地各含水层水文地质参数的基本规律和特性，即：各含水层渗透系数自上而下逐渐增加且表现为各向异性，其水平渗透系数大于垂直渗透系数，其比值介于1.6～2.6之间。工程实例表明，采用各向异性的水文地质参数和三维渗流分析进行的超深基坑降水设计，结果更接近于实际，且有利于降低工程造价和基坑周边环境损伤，亦有利于节约宝贵的地下水资源。
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| 关 键 词： | 长江Ⅰ级阶地 分层抽水试验 群井抽水试验 渗透系数 各向异性 三维渗流分析 |
| 收稿时间： | 2016-07-12 |
Research on hydrogeological parameters of aquifer in 1st terrace of Yangtze River in Wuhan and its application |
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| XU Yang-qing,LIU Guo-feng,WU Xi-chen.Research on hydrogeological parameters of aquifer in 1st terrace of Yangtze River in Wuhan and its application[J].Rock and Soil Mechanics,2016,37(10):2915-2920. |
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| Authors: | XU Yang-qing LIU Guo-feng WU Xi-chen |
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| Institution: | Wuhan Design and Research Institute of China Coal Technology & Engineering Group, Wuhan, Hubei 430064, China |
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| Abstract: | The permeability coefficient of the aquifer in the first terrace of the Yangtze River in Wuhan is inevitably anisotropic under the effect of the sediment dynamics sorting and consolidation pressure of the overlying soil. Therefore, the dewatering design based on the isotropic permeability coefficient of aquifer and the hydrogeological parameters obtained from a single well and steady flow pumping test is inevitably different from the actual engineering. Based on the stratified pumping test, the group drilling pumping test and combined with three-dimensional numerical inversion simulations, the basic laws and characteristics of the aquifer hydrogeological parameters are concluded in the first terrace of Yangtze River in Wuhan. The permeability coefficients gradually increase from top to bottom and show anisotropy in different aquifers. The horizontal permeability coefficient is greater than the vertical permeability coefficient, and the ratios of them are between 1.6 and 2.6. The case study shows that the dewatering design of deep foundation pit made in accordance with the result of the anisotropy of hydrogeological parameters and the three-dimensional seepage analyses is much more approximate to the actual situation. In addition, this method reduces the project cost and minimizes the impact of foundation pit excavation on surrounding environments. Moreover, it is also conducive to save precious groundwater resources. |
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| Keywords: | the 1st terrace of Yangtze River stratified pumping test group drilling pumping test permeability coefficient anisotropy three-dimensional seepage analysis |
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