陈凌铜 朱丹 杨超 曾怡婷 徐长节

摘 要：依托杭州沿江大道地下綜合管廊深基坑工程，土体采用HSS模型进行有限元数值模拟，分析基坑降水开挖下基坑及邻近管线的变形，模拟结果与监测结果吻合较好，验证了有限元计算模型和参数选取的合理性。基于模拟提出隔断式基坑降水优化方案，并研究稳态渗流下隔水帷幕插入深度不同时基坑及邻近管线的变形响应。结果表明：随着悬挂式隔水帷幕深度加深，坑内外水头差线性增大，围护结构侧移峰值线性增大，管线竖向位移、坑外地表沉降线性减小;相较于悬挂式隔水帷幕，隔断式隔水帷幕对控制基坑降水引起的坑外地表沉降及邻近管线变形均有着显著优势，但对于围护结构变形控制则不利。

关键词：降水开挖;隔水帷幕;基坑变形;渗流;HSS模型

中图分类号：TU46   文献标志码：A   文章编号：2096-6717（2020）04-0024-09

收稿日期：2020-06-11

基金项目：国家杰出青年科学基金（51725802）;国家自然科学基金（51878276）;浙江省自然科学基金委员会华东院联合基金（LHZ19E080001）;国家自然科学基金高铁联合基金（U1934208）

作者简介：陈凌铜（1987- ），男，主要从事水务排水及市政基础设施研究，E-mail： 252362747@qq.com。

徐长节（通信作者），男，教授，博士生导师，E-mail： xucj@zju.edu.cn。

Received：2020-06-11

Foundation items：The National Science Fund for Distinguished Young Scholars （No. 51725802）; National Natural Science Foundation of China （No. 51878276）; Zhejiang Province Natural Science Fund Committee- East China Mutual Funds （No. LHZ19E080001）; National Natural Science Foundation of China-High Speed Railway Joint Fund （No. U1934208）

Author brief：CHEN Lingtong （1987- ）， main research interests： water drainage and municipal infrastructure construction project management， E-mail： 252362747@qq.com.

XU Changjie （corresponding author）， professor， doctoral supervisor， E-mail： xucj@zju.edu.cn.

Influence of waterproof curtain on deformation control of deep foundation pit dewatering and excavation

CHEN Lingtong1，ZHU Dan2，YANG Chao3，ZENG Yiting4，XU Changjie4，5

（1.Hangzhou Water Holding Group Co.， Ltd.， Hangzhou 310009， P. R. China; 2. Hangzhou CBD Construction Development Co.， Ltd.， Hangzhou 310020， P. R. China; 3. Hangzhou Municipal Facilities Supervision Center， Hangzhou 310003， P. R. China; 4.Research Center of Coastal and Urban Geotechnical Engineering， Zhejiang University， Hangzhou 310058， P. R. China; 5. Jiangxi Key Laboratory of Infrastructure Safety Control in Geotechnical Engineering， East China Jiaotong University， Nanchang 330013， P. R. China）

Abstract： Based on the deep foundation pit project of the utility tunnel of Yanjiang Avenue in Hangzhou， the HSS model was used for finite element numerical simulation to analyze the deformation of the foundation pit and adjacent pipelines under the dewatering excavation of the foundation pit. The simulation results are in good agreement with the monitoring results， which verifies the rationality of the finite element calculation and parameter selection. Based on the results， an optimized plan for dewatering of the partitioned foundation pit has been proposed， and the deformation response of the foundation pit and adjacent pipelines was studied when the penetration depth of the water-insulating curtain was different under steady-state seepage. The research results show that as the depth of the suspended waterproof curtain increases， the head difference of ground water between the inside and outside of the pit and the peak value of the lateral displacement of the retaining structure increases linearly， and the vertical displacement of the pipeline and the surface settlement outside the pit decrease linearly; Compared with the suspended waterproof curtain， the waterproof curtain has significant advantages in controlling the surface settlement outside the pit and the deformation of adjacent pipelines， however it is more unfavorable for the deformation control of the retaining structure.

Keywords：foundation pit excavation and dewatering; waterproof curtain; foundation pit deformation; seepage; HSS model

随着城市地下空间开发利用规模不断扩大，深基坑工程与既有建（构）筑物邻近的情况越发常见，基坑变形控制要求更加严格，工程降水对周边环境的影响也越来越得到重视，因此，基坑及周边环境变形控制研究在深基坑降水及开挖工程中具有重要意义。……