深基坑弧形咬合桩结构受力分析与优化

钱骥; 荚瑞馨; 李栋; 章力

doi:10.3724/j.gyjzG23081301

深基坑弧形咬合桩结构受力分析与优化

doi: 10.3724/j.gyjzG23081301

钱骥^1,2,
荚瑞馨^3, ,,
李栋⁴,
章力⁵

1. 桥梁工程结构动力学国家重点实验室(招商局重庆交通科研设计院有限公司), 重庆 400067;
2. 重庆交通大学土木工程学院, 重庆 400074;
3. 北京工业大学, 北京 100124;
4. 公路科学研究院, 北京 100000;
5. 中铁四局第四工程有限公司, 合肥 230000

基金项目:

桥梁工程结构动力学国家重点实验室开放基金；重庆市自然科学基金面上项目（CSTB2023NSCQ-MSX0633）；重庆市研究生导师团队建设项目（JDDSTD2022003）。

详细信息

作者简介:
钱骥，教授，主要研究方向为桥梁健康监测，加固设计，jiqian228@126.com。

通讯作者:
荚瑞馨，博士研究生，主要研究方向为桥梁加固与改造设计，CQ19823689185@163.com。

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出版历程
- 收稿日期: 2023-08-13
- 网络出版日期: 2025-11-05

Stress Analysis and Optimization of Arc-Shaped Occlusal Pile Structure in Deep Foundation Pit

QIAN Ji^1,2,
JIA Ruixin^{3
, ,},
LI Dong⁴,
ZHANG Li⁵

1. State Key Lab of Structural Dynamics of Bridge Engineering (China Merchants Chongqing Communications Technology Research & Design Institute Co., Ltd.,), Chongqing 400067, China;
2. School of Civil Engineering, Chongqing Jiaotong University, Chongqing 400074, China;
3. Beijing University of Technology, Beijing 100124, China;
4. Highway Research Institute, Beijing 100000, China;
5. China Railway Fourth Engineering Co., Ltd., Hefei 230000, China

摘要

摘要: 咬合桩支护结构具有对周围地基扰动较小、可靠性和整体性较高以及对环境影响较小等优点，近年来在深基坑工程支护结构中得到了广泛关注和应用。但当基坑深度较大、场地受限时，直线型和圆形支护结构难以满足使用要求。以岷江某特大拱桥拱座深基坑支护结构为例，从薄壳计算理论出发，建立弧形咬合桩理论计算模型，并与三维有限元计算结果及现场实测数据对比分析，同时改变结构的重要参数，优化支护结构的合理设计参数。结果表明：弧形咬合桩支护结构的水平位移量从角点至边中逐渐增大，边长50 m的深基坑其最大深度为18.6 m，最大变形量仅为10.2 mm，能够有效抵抗水土压力变形；基于壳体理论模型计算支护结构变形与实测值吻合较好；咬合桩直径取1.2~1.6 m较为合适，采用增加桩顶系梁能大幅提高支护能力，边中外侧布置加强桩效果远优于角点位置。该研究成果对弧形咬合桩支护结构优化具有指导意义。
- 深基坑支护结构 /
- 弧形咬合桩 /
- 壳体理论 /
- 数值分析 /
- 结构参数优化
Abstract: Occlusal pile supporting structure has been widely applied in deep foundation pit engineering in recent years， due to its advantages of less disturbance to the surrounding foundation， higher reliability and integrity， and less environmental impact. However， when the pit depth is large and the site is limited， the linear and circular supporting structures are difficult to meet the requirements. In this paper， the arch support structure of a large arch bridge in the Minjiang River was taken as the case. Based on the calculation theory of thin shell， a theoretical calculation model of arc-shaped occlusion pile was established and compared with the three-dimensional finite element calculation results and the field measured data. At the same time， the important parameters of the structure were changed to optimize the reasonable design parameters of the supporting structure. The results showed that the horizontal displacement of the arc-shaped occlusal pile supporting structure increased gradually from the corner point to the edge center. The maximum depth of a 50 m deep foundation pit with a side length was 18.6 m， and the maximum deformation was only 10 mm， which can effectively resist the deformation of soil and water pressure. The calculated deformation of the supporting structure based on the theoretical model of the shell was in good agreement with the measured values. The diameter of the occlusal pile was 1.0 m to 1.4 m， and the addition of the pile top tie beam could greatly improve the supporting ability. The effect of the arrangement of the side， middle and outside was far better than that of the corner position. This research has certain guiding significance for the optimization of the arc occlusal pile supporting structure.
- deep foundation pit supporting structure /
- arc occlusal pile /
- shell theory /
- numerical analysis /
- optimization of structural parameters

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