土工基础

土工基础 ›› 2025, Vol. 39 ›› Issue (4): 529-536.

• 工程实录 • 上一篇    下一篇

共壁深基坑盖挖区桩柱变形实测分析及控制措施

陶连金1，高腾飞1，焦伯阳1，赵 旭1，郭 飞2，张 宇1,3   

  1. （1.北京工业大学城市与工程安全减灾省部共建教育部重点实验室，北京 100124；2.北京市政建设集团有限责任公司，北京 100048；3.北京建筑大学土木与交通工程学院，北京 102627）
  • 收稿日期:2023-07-21 修回日期:2023-08-09 出版日期:2025-08-31 发布日期:2025-08-27
  • 作者简介:陶连金（1964-），男，博士，教授，博士生导师，研究方向为岩土与地下工程。

Measured Analysis and Control Measures of Columns in Cover Excavation of Adjacent Deep Excavation with a Common Wall

TAO Lianjin1, GAO Tengfei1, JIAO Boyang1, ZHAO Xu1, GUO Fei2, ZHANG Yu1,3   

  1. (1.The Key Laboratory of Urban Security and Disaster Engineering, Ministry of Education, Beijing University of Technology, Beijing 100124;
    2.Beijing Municipal Construction Co. Ltd., Beijing 100048;
    3.Civil and Transportation Engineering, Beijing University of Civil Engineering and Architecture, Beijing 102627)
  • Received:2023-07-21 Revised:2023-08-09 Online:2025-08-31 Published:2025-08-27

摘要： 随着城市化进程加快，大型地下空间开发的进程也随之加快，会出现较多数量的相邻深基坑同时或交叉施工，相邻基坑的支护结构在施工过程中将产生复杂的变形，其中采用盖挖逆作法施工的支撑桩柱的变形性状，不仅关系到基坑本身的稳定和安全，而且对于完工后地下地上结构的稳定起着重要作用。以北京城市副中心交通枢纽项目为工程依托，对明挖与半盖挖共壁深基坑工程施工过程的盖挖逆作区桩柱变形实测数据进行分析，并采用PLAXIS软件进行共壁深基坑开挖全过程模拟，进一步提出盖挖逆作区桩柱变形控制措施。研究表明：①桩柱竖向变形最大为41 mm，变形沿南北方向呈现两侧大中间小，沿东西方向呈两侧小中间大；②共壁深基坑开挖至坑底，各列桩柱水平变形最大值仅为1.1 mm，变形方向偏向02B基坑明挖区一侧；③降低承压水（三）水头至-9.8 m标高、增加钻孔灌注桩嵌入比至2.0能有效控制桩柱竖向变形；④当03A基坑先施工时，可以提前施工B1层楼板使桩柱水平变形得到有效控制。研究成果可为相似工程提供一定的参考与借鉴。

关键词: 共壁, 深基坑, 桩柱变形, 实测分析, 变形控制

Abstract: With the acceleration of urbanization, the process of large-scale underground space development is also accelerated, and there will be a larger number of adjacent deep excavations at the same time or cross-construction. The support structure of adjacent deep excavations will produce complex deformation during the construction. The deformation of bracing structures in deep excavations using the top-down construction method is not only very important to the stability and safety of deep foundation, but also to the stability of underground and above-ground structures. The Beijing City Sub-Central Station Comprehensive Transportation Hub Project is presented in this paper as the case history. The measured data of deformation of columns in covered excavation of open cut deep excavation and semi-covered excavation deep excavation with common wall of the construction is analyzed. The PLAXIS software is used to simulate the entire process of adjacent deep excavation with common walls, and the deformation control measures of columns in the excavation with cover excavation area are proposed. The results show: (1) The maximum vertical deformation of the columns is 41mm, the deformation of columns shows large sides and small in the middle in the north-south direction, and small on both sides and large in the middle in the east-west direction; (2) The excavation of the adjacent excavations with common wall to the bottom of the excavation, the maximum horizontal deformation of each column is only 1.1mm, and the deformation direction is biased to the side of the open excavation area of pit 02B; (3) Reducing the head of confined-water (iii) to 9.8m elevation and increasing the embedment ratio of bored piles to 2.0 can effectively control the vertical deformation of columns; (4) When pit 03A is excavated first, the B1 floor slab can be constructed in advance so that the horizontal deformation of columns can be effectively controlled. The research results can provide some references and lessons for similar projects.

Key words: Common Wall, Deep Excavations, Deformation of Columns, Monitored Data, Control Measures

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