深厚强透水含水层地铁基坑地下水控制方案综合比选方法
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深圳大学 土木与交通工程学院

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TU924

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(Foundation item):国家自然科学基金资助项目(51938008); 中国博士后科学基金资助项目(2021T140474)


Comprehensive comparison of various scenarios to groundwater control for a deep metro excavation in highly-permeable aquifers
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College of Civil and Transportation Engineering,Shenzhen University

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    摘要:

    针对深厚强透水含水层地铁基坑地下水控制方案比选问题,本文联合运用层次分析法、模糊综合评价法以及数值计算方法,提出了深厚强透水含水层地铁基坑地下水控制方法定性与定量化比选流程框架,建立了强透水地层地铁基坑地下水控制方案综合比选方法。以福州水部地铁车站基坑为例,采用建立的比选方法,对5种不同基坑地下水控制方案(敞开式降水、落底式止水帷幕、深层水平封底帷幕、悬挂式帷幕降水以及水下开挖)进行了定性评估分析,结果表明悬挂式帷幕降水方案为该车站基坑地下水控制最优方案。随后,采用数值模拟方法,分析得到了基坑降水引发周边建筑范围内的沉降值在12–23 mm 范围,由此表明42 m悬挂式止水帷幕能有效地控制基坑降水引发的地表沉降。该方法为强透水含水层地铁基坑工程地下水控制比选设计提供了解决思路。

    Abstract:

    For the comparison and selection of groundwater control scenarios for subway foundation pits in deep and high permeable aquifers, this paper presents the qualitative and quantitative comparison and selection framework of groundwater control scenarios for subway foundation pit by using analytic hierarchy process, fuzzy comprehensive evaluation method and numerical calculation method. A comprehensive comparison of various scenarios to groundwater control for a deep metro excavation in highly-permeable aquifers is established. Taking the foundation pit of Shuibu metro station in Fuzhou as an example, five different groundwater control scenarios (i.e. open dewatering, fully penetrating curtains, deep horizontal bottom sealing curtain, partially penetrating curtains with dewatering, underwater excavation) are evaluated and analyzed using proposed comparison method. The results show that the scenario of both partially penetrating curtains and dewatering is the best one for the groundwater control of the foundation pit of the station. Then, the numerical simulation method is used to analyze the surrounding surface settlement caused by foundation pit dewatering. The results show that the settlement of the buildings is in the range of 12–23 mm, which shows that the partially penetrating curtains with 42 m length can effectively control the surface settlement caused by dewatering. This method provides a solution for the comparison and design of groundwater control scenarios for subway foundation pits in deep and high permeable aquifers.

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  • 收稿日期:2022-01-11
  • 最后修改日期:2022-04-11
  • 录用日期:2022-04-22
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