先浅后深工序下结合CFG桩的三排桩基坑支护设计

章良兵; 黄昌乾

doi:10.20265/j.cnki.issn.1007-2993.2024-0520

先浅后深工序下结合CFG桩的三排桩基坑支护设计

doi: 10.20265/j.cnki.issn.1007-2993.2024-0520

中航勘察设计研究院有限公司，北京　100098

详细信息

作者简介:
章良兵，男，1991年生，硕士，高级工程师，主要从事岩土工程设计与施工。E-mail：1048667498@qq.com

中图分类号: TU473
计量
- 文章访问数: 24
- HTML全文浏览量: 3
- PDF下载量: 8
- 被引次数: 0
出版历程
- 收稿日期: 2024-11-11
- 修回日期: 2025-02-13
- 录用日期: 2025-04-09
- 刊出日期: 2026-02-06

Design of triple-row pile foundation pit support combined with CFG piles under shallow to deep process

AVIC Institute of Geotechnical Engineering Co., Ltd., Beijing 100098, China

摘要

摘要: 北京地区某建筑项目高层住宅楼与纯地下车库毗邻，二者基础高差7.6 m，根据施工进度安排，位于浅部的住宅楼需先于车库施工，毗邻段车库基坑支护设计需考虑最不利工况，即住宅结构封顶时车库基坑肥槽尚未回填。为有效控制深部基坑与浅部住宅楼变形，对深部基坑采用结合浅部住宅楼CFG桩的三排桩支护方案。数值模拟和基坑变形监测表明，深部基坑变形和浅部住宅沉降及倾斜均处于可控范围，浅部住宅楼荷载绝大部分通过CFG桩传递至深部地层中，对深部基坑影响较小。本方案中CFG桩兼作竖向承载和水平承载构件，可采用扩径和配筋相结合的措施增加其侧向刚度，同时需要注意控制复合地基承载力和刚度的均匀性。
- 先浅后深 /
- CFG桩 /
- 三排桩 /
- 变形预测 /
- 变形监测
Abstract: In a construction project in Beijing, a high-rise residential building is adjacent to an underground garage, with a foundation height difference of 7.6 m. According to the construction schedule, the shallow residential building must be completed before the garage excavation. The design of the garage’s foundation pit support must consider the most critical scenario: the residential structure is topped out while the backfill space of the garage pit remains unfilled. To effectively control deformation in the deep foundation pit and the shallow residential building, a triple-row pile support system is adopted, integrating the adjacent CFG piles of the residential building. Numerical simulations and field monitoring demonstrate that deformations in the deep pit, settlement, and inclination of the residential building are within controllable limits. The load from the residential building is primarily transferred to deeper strata via the CFG piles, exerting minimal impact on the deep excavation. In this scheme, CFG piles serve dual functions: vertical load-bearing and lateral resistance. Their lateral stiffness is enhanced through a combination of diameter expansion and reinforcement. Additionally, uniformity in the bearing capacity and stiffness of the composite foundation must be rigorously controlled.
- shallow to deep /
- CFG pile /
- triple-row pile /
- prediction of deformation /
- deformation monitoring

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图 1 项目平面位置关系图

Figure 1. Planar positional relationship diagram of the project

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图 2 典型地层剖面

Figure 2. Typical stratigraphic section

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图 3 2^#楼与地库平面位置关系图

Figure 3. 2^# Building and underground garage plane position relationship diagram

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图 4 双排桩支护计算结果

Figure 4. Calculation results of double-row pile support scheme

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图 5 先浅后深支护段剖面图（单位：mm）

Figure 5. Section diagram of foundation pit support under shallow to deep process（Unit:mm）

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图 6 网格模型

Figure 6. Mesh model

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图 7 水平变形模拟结果

Figure 7. Horizontal deformation simulation results

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图 8 竖向沉降模拟结果

Figure 8. Vertical settlement simulation results

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图 9 监测点平面布置图

Figure 9. Layout diagram of monitoring points

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图 10 桩顶水平位移曲线图

Figure 10. Pile top horizontal displacement curve diagram

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图 11 深层水平位移曲线图

Figure 11. Deep horizontal displacement curve diagram

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图 12 竖向沉降位移曲线图

Figure 12. Vertical settlement displacement curve diagram

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表 1 各土层主要物理力学参数

Table 1. Main physical and mechanical parameters of each soil layer

地层岩性	γ/（kN·m⁻³）	E_s1-2/MPa	c/kPa	φ/（°）
②黏质粉土–砂质粉土	19.9	11.4	20	26.7
③粉质黏土–黏质粉土	19.5	6.1	25	10.4
④粉质黏土–黏质粉土	19.9	6.9	22	16.7
⑤粉质黏土–黏质粉土	19.8	8.5	25	20
⑤2细砂	20	30	0	25
⑥全风化–强风化泥岩	21	7.2	35	30
⑦强风化–中等风化泥岩	22	50	40	35
⑧中等风化泥岩	23.7	80	70	60

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表 2 结构单元参数

Table 2. Structural element parameters

构件类别	材料	弹性模量 E/MPa	重度γ /（kN·m⁻³）	外径 D/m	厚度 h/m	截面尺寸 B×H /（m×m）
钢筋桩	C25钢筋混凝土	28 000	25.0	0.6
CFG桩	C25素混凝土	28 000	23.0	0.4
挡土板	C20钢筋混凝土	21 500	24.0		0.1
冠梁及连梁	C25钢筋混凝土	28 000	25.0			0.7×0.5

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