深基坑开挖对临近建筑物的稳定性分析

康凯; 李宁; 石卫; 谭天翔; 王姝婧

doi:10.20265/j.cnki.issn.1007-2993.2023-0822

深基坑开挖对临近建筑物的稳定性分析

doi: 10.20265/j.cnki.issn.1007-2993.2023-0822

康凯^1,,
李宁¹,
石卫^{2, 3},
谭天翔⁴,
王姝婧¹

1.
西安理工大学土木建筑工程学院，陕西西安　710048
2.
陕西省城市地质与地下空间工程技术研究中心，陕西西安　710068
3.
陕西省水工环地质调查中心，陕西西安　710068
4.
中国建筑第八工程局有限公司，上海　200112

基金项目: 陕西省重点研发计划项目（2021SF2-02）；陕西省公益性地质专项（202109，20180303）

详细信息

作者简介:
康　凯，男，1998年生，在读博士研究生，主要从事基坑工程方面研究。E-mail：KangKai-xaut@qq.com

中图分类号: TU470
计量
- 文章访问数: 6
- HTML全文浏览量: 4
- PDF下载量: 2
- 被引次数: 0
出版历程
- 收稿日期: 2023-10-31
- 修回日期: 2024-04-15
- 录用日期: 2024-05-09
- 刊出日期: 2025-02-21

Stability analysis of deep foundation pit excavation on adjacent buildings

1.
School of Civil and Architectural Engineering, Xi’an University of Technology, Xi’an 710048, Shaanxi, China
2.
Shaanxi Engineering Technology Research Center for Urban Geology and Underground Space, Xi’an 710068, Shaanxi, China;
3.
.Shaanxi Hydrogeolog Engineering Geology and Environment Geology Survey Center, Xi’an 710068, Shaanxi, China
4.
China Construction Eighth Engineering Bureau Co., Ltd., Shanghai 200112, China

摘要

摘要: 由深基坑开挖卸荷引起的邻近既有建筑物变形问题是城市基础设施建设面临的热点和难点问题。依托西安某大厦改扩建工程建立数值模型，以不同支护结构、建筑物与基坑间距为研究变量，分析了不同工况下深基坑开挖对邻近既有建筑物稳定性的影响特性。结果表明：桩锚支护体系的围护效果最好，双排桩在合适的排桩间距下也能发挥良好的支护效果；随着建筑物与基坑间距的增大，建筑物所受到的扰动随之减小，基坑开挖造成的扰动具有一定的范围，本工程条件下，在12 m之外的建筑物所受扰动不会影响其安全使用。
- 基坑开挖 /
- 邻近建筑 /
- 支护结构 /
- 变形
Abstract: The deformation of adjacent existing buildings induced by deep foundation pit excavation and unloading poses a significant and challenging issue in urban infrastructure construction. A numerical analysis model was established based on the reconstruction and expansion project of a building in Xi’an. Different supporting structures and the spacing between buildings and the foundation pit were investigated as research variables to analyze the impact characteristics of deep foundation pit excavation on adjacent existing buildings under various working conditions. The results revealed that the pile-anchor support system exhibited the best enclosure effect, while double-row piles could also achieve good supporting performance under appropriate pile spacing. Furthermore, the disturbance caused by foundation pit excavation has a limited range; specifically, buildings located beyond 12 m from the excavation site experienced negligible disturbance that did not compromise their safe use.
- foundation pit excavation /
- adjacent buildings /
- support structure /
- deformation

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图 1 基坑平面布置图

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图 2 AB段支护正立面图（单位：mm）

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图 3 AB段支护剖面图

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图 4 监测点位图

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图 5 整体模型示意图

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图 6 总体支护结构效果图

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图 7 建筑物的桩基础模拟效果图

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图 8 K13号桩深层水平位移模拟值与实测值对比

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图 9 基坑北侧桩顶水平位移模拟值与实测值对比

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图 10 邻近建筑物沉降量模拟值与监测值对比

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图 11 双排桩模型简图

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图 12 不同支护体系支护水平位移

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图 13 不同支护体系下墙后土体竖向位移曲线

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图 14 不同支护体系下建筑物竖向位移

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图 15 不同间距下支护水平位移曲线图

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图 16 不同间距下墙后土体竖向位移曲线图

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图 17 不同间距下建筑物沉降变化图

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表 1 基坑土层物理力学参数

地层	c/kPa	φ/（°）	γ/（kN·m⁻³）	E/MPa
素填土	10.0	10.0	19.1	11.4
黄土1	21.0	18.5	16.2	16.4
黄土2	23.0	18.5	16.2	22.5
古土壤	26.0	19.5	19.5(水下9.5)	32.8
粉质黏土	38.0	22.0	19.5(水下9.5)	42.6

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表 2 基坑开挖工序

工序	施工内容
1	第一层开挖，开挖深度2 m
2	激活第一层冠梁、第二层腰梁
4	开挖至5 m处
5	激活第三层腰梁单元施加第一排锚索
6	开挖至8 m处
7	激活第四层腰梁单元施加第二排锚索
8	开挖至11 m处
9	激活第五层腰梁单元施加第三排锚索
10	开挖至14 m处
11	激活第六层腰梁单元施加第四排锚索
12	开挖至17 m处
13	激活第七层腰梁单元施加第五排锚索
15	开挖至20 m处
16	激活底部垫层单元

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