• CSCD核心中文核心科技核心
  • RCCSE(A+)公路运输高质量期刊T1
  • Ei CompendexScopusWJCI
  • EBSCOPж(AJ)JST
二维码

隧道建设(中英文) ›› 2025, Vol. 45 ›› Issue (S2): 97-106.DOI: 10.3973/j.issn.2096-4498.2025.S2.008

• 研究与探索 • 上一篇    下一篇

流变软土地层深基坑开挖对既有车站影响与加固效应分析——以上海金桥地铁上盖项目为例

张治国1, 万启蒙1, *, 李骏杰2, 倪寅2, 贾浩然1, 魏坚1   

  1. (1. 上海理工大学环境与建筑学院, 上海 200093; 2. 上海市浦东新区建设(集团)有限公司, 上海 200137)
  • 出版日期:2025-12-20 发布日期:2025-12-20
  • 作者简介:张治国(1978— ),男,河北秦皇岛人,2009年毕业于同济大学,岩土工程(隧道及地下建筑工程)专业,博士后,教授,主要从事岩土地下工程方面的研究工作。 E-mail: zgzhang@usst.edu.cn。 *通信作者: 万启蒙, E-mail: 652731905@qq.com。

Impact of Deep Foundation Pit Excavation on Existing Metro Stations in Rheological Soft Strata and Reinforcement Effects: A Case Study of Shanghai Jinqiao Metro Over-Track Project

ZHANG Zhiguo1, WAN Qimeng1, *, LI Junjie2, NI Yin2, JIA Haoran1, WEI Jian1   

  1. (1. School of Environment and Architecture, University of Shanghai for Science and Technology, Shanghai 200093, China; 2. Shanghai Pudong New Area Construction (Group) Co., Ltd., Shanghai 200137, China)
  • Online:2025-12-20 Published:2025-12-20

摘要: 为准确评估流变软土环境下基坑开挖对邻近轨道交通设施的结构安全影响,以上海金桥地铁上盖项目为依托,采用有限元数值模拟方法并结合现场监测数据,对基坑开挖过程中地铁道床变形、周边地表沉降进行分析,同时研究“三轴搅拌桩满堂加固与邻近地铁侧MJS桩加固结合”等组合控制技术对基坑开挖过程中地铁道床变形的影响规律。研究表明: 1)MJS工法桩等加固施工会诱发道床隆起,影响强度由基坑边缘向外衰减,最大影响区集中于基坑中心线附近,施工结束后随时间增加隆起值逐渐减小; 2)基坑开挖导致西侧地铁道床呈“M”形隆起,其中前2层土体开挖引起的隆起值增量较大; 3)临河道侧地铁道床,由于基坑降水以及渗流作用而发生沉降,最大沉降量为1.44 mm; 4)基坑南北两侧地表分别发生隆起和沉降,分别表现为“勺”形与空间衰减分布; 5)采用MJS工法桩与三轴搅拌桩进行土体加固后,显著降低了道床竖向位移,降幅接近40%

关键词: 流变软土, 深基坑, 既有地铁车站, 加固

Abstract: To accurately assess the impact of foundation pit excavation on the structural safety of adjacent rail transit facilities in a rheological soft soil environment, a case study is conducted on the Shanghai Jinqiao Metro Over-track Project. Based on finite element numerical simulation methods and field monitoring data, the deformation of the metro track bed and the settlement of the surrounding ground surface during foundation pit excavation are analyzed. Additionally, the influence of combined control techniques, such as "full-area reinforcement with triaxial deep stirring piles and metro jet system (MJS) piles on the adjacent metro", on the deformation of the metro track bed during foundation pit excavation is examined. Research indicates that: (1) Reinforcement construction using the MJS method induces track bed heaving, with its effect decreasing outward from the edge of the foundation pit. The maximum impact zone is concentrated near the centerline of the foundation pit, and the heaving value gradually decreases over time after construction is completed. (2) The foundation pit excavation causes the west side of the metro track bed to heave in an M shape, with the excavation of the first two layers of soil contributing significantly to the increase in heave. (3) The metro track bed adjacent to the riverbank subsides due to foundation pit dewatering and seepage, with a maximum settlement of 1.44 mm. (4) The surface on the north and south sides of the foundation pit undergoes uplift and subsidence, respectively, manifesting as a "spoon-shaped" distribution and a spatially decaying distribution. (5) Following soil reinforcement using MJS piles and triaxial deep stirring piles, the vertical displacement of the track bed is significantly reduced, by nearly 40%.

Key words: rheological soft soil, deep foundation pit, existing metro station, reinforcement