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《建筑科学与工程学报》[ISSN:1673-2049/CN:61-1442/TU]

卷:

38卷

期数:

2021年06期

页码:

128-137

栏目:

软土基坑设计与变形控制

出版日期:

2021-11-05

文章信息/Info

Title:

Supporting Design and Application of Deep Excavation Adjacent to Metro Tunnels in Soft Soil Area

文章编号:

1673-2049(2021)06-0128-10

作者:

李煜峰^1,2,傅 怡³,徐中华^1,2

(1. 华东建筑设计研究院有限公司 上海地下空间与工程设计研究院,上海 200002; 2. 上海基坑工程环境安全控制工程技术研究中心,上海 200002; 3. 上海市隧道工程轨道交通设计研究院,上海 200235)

Author(s):

LI Yu-feng^1,2, FU Yi³, XU Zhong-hua^1,2

(1. Shanghai Underground Space Engineering Design and Research Institute, East China Architecture Design and Research Institute Co., Ltd., Shanghai 200002, China; 2. Shanghai Engineering Research Center of Safety Control for Facilities Adjacent to Deep Excavations, Shanghai 200002, China; 3. Shanghai Tunnel Engineering & Rail Transit Design and Research Institute, Shanghai 200235, China)

关键词:

软土;  深基坑;  地铁隧道;  支护设计;  变形控制

Keywords:

soft soil;  deep excavation;  metro tunnel;  supporting design;  deformation control

分类号:

TU447

DOI:

10.19815/j.jace.2021.08052

文献标志码:

A

摘要:

以上海竹园2-16-1地块项目深基坑工程为背景,介绍了邻近地铁的软土深基坑变形控制方法及其效果。根据基坑工程的特点,设计时采取了多种地铁保护专项技术措施,包括基坑分区实施方案、支护体系、钢支撑轴力补偿系统、坑内被动区加固、承压水控制措施等。结果表明:基坑各分区地下连续墙最大侧向位移小于上海软土地区基坑地下连续墙最大侧移的统计平均值0.42%H(H为基坑最大开挖深度),特别是靠近地铁侧的地下连续墙最大侧向位移接近上海软土地区基坑地下墙最大侧移的统计下限值0.1%H; 地铁侧坑外承压水位总体保持在比较平稳的水平,最大水位变化仅为0.72 m; 邻近的地铁隧道上行线和下行线的累计最大沉降量分别为8.2 mm和5.1 mm,均小于地铁下沉量允许值(20 mm),且隧道曲率半径满足控制值要求; 本基坑采用的系统变形控制措施有效地保障了邻近地铁的安全,其设计和施工方法可以为软土地区同类基坑工程设计提供参考。

Abstract:

The deformation control methods of the deep excavation adjacent to metro and its effect are introduced based on the deep excavation of Shanghai Zuyuan 2-16-1 Block project. According to the characteristics of the excavation engineering, a variety of technical measures were taken to protect the adjacent metro tunnels, including zoned excavation method, proper supporting system, steel support automatic axial force compensation system, ground treatment, and confined ground water control design. The results show that the maximum lateral displacement of diaphragm wall for each excavation zone is less than the statistical average value(0.42%H, H is the excavation depth)in Shanghai soft deposit, while the maximum lateral displacement of diaphragm wall in the excavation zones adjacent to the metro tunnels is quite close to the statistical lower limit value, which is 0.1%H. The confined water level near the metro tunnel area maintains a relatively stable level and the maximum water level variation is only 0.72 m. The cumulative maximum settlement of the adjacent metro tunnels upstream and downstream are 8.2, 5.1 mm respectively, which are less than the 20 mm allowable limit. Moreover, the tunnel curvature radius meets the requirement of the control value. Deformation control methods adopted in the project are proved to be effective in protecting the safety of the adjacent metro tunnels. Design and construction methods in the project can provide a reference for similar excavation projects in soft soil area.

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相似文献/References:

[1]蒋建平.被动区土体加固范围对整个深基坑的影响[J].建筑科学与工程学报,2012,29(04):96.
　JIANG Jian-ping.Influence of Soil Mass Reinforcement Scope in Passive Zone on Whole Deep Excavation[J].Journal of Architecture and Civil Engineering,2012,29(06):96.
[2]陈达章,陈天翼,牟太平,等.软土桩基上拓宽路堤的变形破坏离心模型试验[J].建筑科学与工程学报,2021,38(06):11.[doi:10.19815/j.jace.2021.08057]
　CHEN Da-zhang,CHEN Tian-yi,MOU Tai-ping,et al.Centrifugal Modeling Test on Deformation and Failure Behavior of Widening Embankment on Soft Soil with Pile Foundation[J].Journal of Architecture and Civil Engineering,2021,38(06):11.[doi:10.19815/j.jace.2021.08057]
[3]于至海,吴旭君,曹文昭.软土深基坑被动区超前加固变形控制效果研究[J].建筑科学与工程学报,2021,38(06):71.[doi:10.19815/j.jace.2021.08056]
　YU Zhi-hai,WU Xu-jun,CAO Wen-zhao.Research on Deformation Control Effect of Passive Zone Reinforcement Before Excavation of Deep Foundation Pit in Soft Soil[J].Journal of Architecture and Civil Engineering,2021,38(06):71.[doi:10.19815/j.jace.2021.08056]

备注/Memo

备注/Memo:

收稿日期:2021-08-11
基金项目:上海市优秀技术带头人计划项目(20XD1430300)
作者简介:李煜峰(1991-),男,江苏昆山人,工程师,工学硕士,E-mail:341066408@qq.com。

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更新日期/Last Update: 2021-11-01