防灾与环境

水平封底式降水对基坑周围环境影响研究

  • 李兆 ,
  • 骆祖江 ,
  • 陆建生 ,
  • 张英英
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  • 1.河海大学 地球科学与工程学院,南京 211100;
    2.上海地下水综合治理工程技术研究中心,上海 200444;
    3.上海广联环境岩土工程股份有限公司,上海 200444
李兆(1990—),男,黑龙江牡丹江人,博士,副教授,主要从事水文地质与工程地质等领域的科研工作。E-mail:liz1990@hhu.edu.cn
骆祖江(1964—),男,江苏吴江人,博士,教授,主要从事水文地质与工程地质等领域的教学与科研工作。E-mail:luozujiang@sina.com

收稿日期: 2024-09-10

  网络出版日期: 2025-06-13

基金资助

国家自然科学基金(42302270);江苏省自然科学基金(BK20220994);中国博士后科学基金(2023M730915);江苏省卓越博士后计划资助项目(2022ZB144)

Study on the Impact of Horizontal Bottom Sealing Dewatering on the Foundation Pit Surrounding Environment

  • Li Zhao ,
  • Luo Zujiang ,
  • Lu Jiansheng ,
  • Zhang Yingying
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  • 1. School of Earth Sciences and Engineering, Hohai University, Nanjing 211100, P.R. China;
    2. Shanghai Engineering Research Center for Comprehensive Groundwater Treatment, Shanghai 200444, P.R. China;
    3. Shanghai Guanglian Environment & Geotechnical Engineering Co., Ltd., Shanghai 200444, P.R. China

Received date: 2024-09-10

  Online published: 2025-06-13

摘要

为了进一步研究水平封底止水帷幕隔水性对基坑周围环境的影响规律。首先,开展高渗透性含水层抽水试验,揭示了高渗透性含水层中垂向止水帷幕内外渗流特征,阐明了地面沉降发生机理;然后,基于地下水渗流理论和有效应力原理,建立了地下水渗流—地面沉降三维耦合数值模型;最后分别模拟预测地下连续墙加深4 m、8 m、12 m和水平封底止水帷幕渗透性减少至原地层渗透性的2%、5%、10%、15%、20%时基坑降水引起的坑外水位降深和地面沉降,进而揭示水平封底式降水对基坑周围环境影响规律。结果表明:水平封底式降水能有效控制基坑降水对周围环境影响,引起的坑外地面沉降减小68.48%~76.37%;当水平封底止水帷幕渗透性减少至原地层渗透性的10%以下时,基坑外地面沉降控制效应显著;大幅度加深地下连续墙对地面沉降同样具有很好的控制作用,但需进一步从地下连续墙施工难度及工程造价方面分析可行性。

本文引用格式

李兆 , 骆祖江 , 陆建生 , 张英英 . 水平封底式降水对基坑周围环境影响研究[J]. 地下空间与工程学报, 2025 , 21(3) : 1076 -1084 . DOI: 10.20174/j.JUSE.2025.03.37

Abstract

In order to study the influence of the water insulation property of the horizontal bottom sealing curtain on the environment around the foundation pit. Firstly, a field test is carried out to reveal the characteristics of groundwater seepage in highly permeable aquifers and the mechanism of land subsidence. Secondly, based on the groundwater seepage theory and the principle of effective stress, a three-dimensional fluid-solid coupling numerical model is established. Finally, the drawdown of groundwater and land subsidence caused by dewatering is simulated when the diaphragm wall is expended by 4 m, 8 m, and 12 m and the permeability of bottom sealing curtains is reduced to 2%, 5%, 10%, 15%, and 20% of the original stratum, respectively. And the impact of the bottom sealing dewatering on the foundation pit surrounding environment is revealed. The results show that: The bottom sealing can effectively control the land subsidence which is reduced by 68.48%~76.37%. When the permeability of bottom sealing curtains is reduced to less than 10% of the original stratum, the control effect of land subsidence is significant. Significant increasing the length of the diaphragm wall could also have a good effect on land subsidence control. However, it is necessary to analyze the feasibility of construction difficulty and cost.

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