桩−撑−锚支护在深厚杂填土基坑中的应用和变形特性研究

魏仁杰; 颜立明

doi:10.20265/j.cnki.issn.1007-2993.2024-0541

桩−撑−锚支护在深厚杂填土基坑中的应用和变形特性研究

doi: 10.20265/j.cnki.issn.1007-2993.2024-0541

中船勘察设计研究院有限公司，上海　200063

详细信息

作者简介:
魏仁杰，1986年生，女，硕士，高级工程师，注册土木工程师（岩土），主要从事岩土工程设计工作。E-mail：382388762@qq.com

中图分类号: TU437
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- 文章访问数: 8
- HTML全文浏览量: 1
- PDF下载量: 1
- 被引次数: 0
出版历程
- 收稿日期: 2024-11-22
- 修回日期: 2025-04-09
- 录用日期: 2025-04-09
- 网络出版日期: 2026-04-09
- 刊出日期: 2026-04-09

Application and deformation characteristics study of pile-brace-anchor support in deep and thick miscellaneous fill foundation pit

China Shipbuilding Industry Institute of Engineering Investigation & Design Co., Ltd., Shanghai 200063, China

摘要

摘要: 以江阴某环境综合整治项目为背景，介绍了在深厚杂填土基坑中桩−锚−撑的支护形式，并根据杂填土的特性及周边建筑的保护要求，提出相应的施工措施。通过PLAXIS 2D有限元模拟和理论计算相结合的方法，分析了围护结构的内力和变形特性以及周边地表的沉降规律。研究结果表明：（1）围护体侧向变形的整体位移主要发生在上部杂填土层中；（2）基坑地表沉降呈勺状分布，最大沉降位于距基坑边约0.5倍开挖深度处；（3）有限元模拟的弯矩值和剪力值与理论计算值存在一些差异，但曲线的整体变化规律基本相同，验证了本文数值计算模型和岩土参数的合理性。
- 深厚杂填土 /
- 桩−锚−撑 /
- PLAXIS 2D /
- 侧向变形 /
- 地面沉降
Abstract: Taking a comprehensive environmental improvement project in Jiangyin as the background, this article introduces the pile-anchor-brace support form in deep miscellaneous fill foundation pits. Based on the characteristics of miscellaneous fill and the protection requirements of surrounding buildings, corresponding construction measures were proposed. By combining PLAXIS 2D finite element simulation with theoretical calculations, the internal forces and deformation characteristics of the retaining structure, as well as the settlement patterns of the surrounding ground, were analyzed. The research results show that: (1) the overall displacement of lateral deformation of the retaining structure mainly occurs in the upper miscellaneous fill layer; (2)the surface settlement is spoon shaped, with the maximum settlement value located at about 0.5 times the excavation depth at the edge of the foundation pit; (3) there are some differences between the bending moment and shear force values simulated by finite element and the theoretical calculation values, but the overall variation pattern of the curves is basically the same, indicating that the established calculation mode and selected soil and rock parameter are all reasonable.
- deep miscellaneous fill /
- pile-anchor-brace /
- PLAXIS 2D /
- lateral deformation /
- surface settlement

HTML全文

图 1 基坑周边环境图

Figure 1. Surrounding environment map of the foundation pit

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图 2 典型地质剖面图（单位：m）

Figure 2. Typical geological cross-section (Unit: m)

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图 3 典型剖面图（单位：mm）

Figure 3. Typical cross-section profile (Unit: mm)

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图 4 典型剖面图（单位：mm）

Figure 4. Typical cross-section profile (Unit: mm)

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图 5 围护桩侧向变形

Figure 5. Lateral deformation of the retaining piles

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图 6 基坑周边地表沉降

Figure 6. Ground surface settlement around the foundation pit

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图 7 围护桩弯矩值

Figure 7. Bending moment value of the retaining piles

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图 8 围护桩剪力值

Figure 8. Shear force value of the retaining piles

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表 1 基坑土层物理力学参数表

Table 1. Physical and mechanical parameters of foundation pit soil layers

层号	土层名称	层厚 /m	重度γ /（kN·m⁻³）	φ_k /（°）	c_k /kPa	渗透系数k /（cm·s⁻¹）
①₁	杂填土	0.50～28.00	19.0^*	15^*	10^*	5.0E-05
①₂	素填土	1.00～12.90	18.5	13.7	14.3	3.0E-05
⑤₂	中等风化砂岩			45^*	120^*	2.0E-05
注：带*均为经验值。

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表 2 板单元计算参数

Table 2. Calculation parameters of the plate element

项目	d /m	EA /(kN·m⁻¹)	EI /(kN·m²·m⁻¹)	W /(kN·m⁻¹·m⁻¹)	泊松比
板	0.706	2.117×10⁷	8.782×10⁵	8	0.2

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