测绘通报 ›› 2024, Vol. 0 ›› Issue (4): 107-111,118.doi: 10.13474/j.cnki.11-2246.2024.0418

• 基础测绘赋能城市建设 • 上一篇    下一篇

考虑空间效应的大型异形基坑开挖变形分析

姜伟玲, 李博, 徐浩, 田承行   

  1. 北京城建集团有限责任公司, 北京 100088
  • 收稿日期:2023-08-23 出版日期:2024-04-25 发布日期:2024-04-29
  • 作者简介:姜伟玲(1988—),女,工程师,主要从事土木建筑工程施工工作。E-mail:jiangweiling18@126.com
  • 基金资助:
    北京市博士后科研活动经费(2022-ZZ-097)

Deformation analysis of large special-shaped foundation pit excavation based on spatial effect

JIANG Weiling, LI Bo, XU Hao, TIAN Chenghang   

  1. Beijing Urban Construction Group Co., Ltd., Beijing 100088, China
  • Received:2023-08-23 Online:2024-04-25 Published:2024-04-29

摘要: 城市紧张的用地环境及复杂的主体结构需求,导致异形基坑越来越常见。目前国内基坑规范推荐的分析方法均不能满足形状对基坑变形的影响。本文以北京某超大异形基坑为依托,建立异形基坑Midas-GTS仿真计算模型,并结合现场实测变形数据,对异形基坑的坑外地表沉降及围护结构变形特征展开研究。结果表明,受基坑形状特征影响,地表沉降及支护结构变形均存在明显的空间效应:地表不均匀沉降现象显著,基坑长边附近沉降大于短边,沉降量随着离坑角距离的增加而显著增大;围护墙长边中间区域变形较大,短边中部次之,结构角点处变形最小。因此,在进行基坑设计支护时,应充分考虑基坑变形的空间效应,节约工程成本,提高基坑整体稳定性。

关键词: 异形基坑, 数值分析, 空间效应, 沉降, 围护结构变形

Abstract: The tense land use environment and the complex main structure demand in the city lead to the more and more common special-shaped foundation pit. The analysis methods recommended by the current domestic foundation pit specifications can not satisfy the influence of shape on the deformation of foundation pit. Based on a large special-shaped foundation pit in Beijing,the Midas-GTS simulation model of special-shaped foundation pit is established,and the deformation characteristics of surface settlement and envelope structure of special-shaped foundation pit are studied in combination with the deformation data measured on site. The results show that the surface settlement and the deformation of the supporting structure have obvious spatial effects under the influence of the shape characteristics of the foundation pit: the surface uneven settlement is significant,the settlement near the long side of the foundation pit is greater than the short side,and the settlement increases significantly with the increase of the distance from the pit angle. The deformation of the middle area of the long side of the wall is larger,followed by the middle of the short side,and the deformation of the corner of the structure is the least. So when designing and supporting foundation pit,the space effect of foundation pit deformation should be fully considered to save project cost and improve the overall stability of foundation pit.

Key words: special-shaped foundation pit, numerical analysis, spatial effect, settlement, retaining structure deformation

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