滨海软基管桩自平衡试桩承载力数值分析及转换系数计算

张君静; 蒋睿

doi:10.20265/j.cnki.issn.1007-2993.2024-0124

滨海软基管桩自平衡试桩承载力数值分析及转换系数计算

doi: 10.20265/j.cnki.issn.1007-2993.2024-0124

张君静,
蒋睿^,

郑州大学水利与交通学院，河南郑州　450001

基金项目: 河南省优秀青年基金项目（232300421069）

详细信息

作者简介:
张君静，女，1973年生，硕士，高级工程师，主要从事公路工程方面的研究。E-mail：m13781196106@163.com

通讯作者:
蒋　睿，男，1999年生，博士研究生，主要从事桩基工程研究。E-mail: jiangruizzu@163.com

中图分类号: TU473.1
计量
- 文章访问数: 15
- HTML全文浏览量: 2
- PDF下载量: 2
- 被引次数: 0
出版历程
- 收稿日期: 2024-03-20
- 修回日期: 2024-09-05
- 录用日期: 2024-10-29
- 刊出日期: 2025-08-08

Numerical analysis of bearing capacity and conversion coefficient calculation of O-cell test of pipe pile in marine soft clay foundation

Zhang Junjing,
Jiang Rui^,

School of Water Conservancy and Transportation, Zhengzhou University, Zhengzhou 450001, Henan, China

摘要

摘要: 与传统桩基检测方法相比，自平衡试桩法可满足大吨位、水上试桩等特殊情况的需求，在近海及海上桩基检测中具有独特的优势。为研究滨海软土地基管桩自平衡法试桩过程的荷载传递特性，分析桩参数对转换系数的影响规律，通过建立桩土数值模型，分别模拟自平衡试桩和传统试桩过程，结合有限元法和等位移法，对转换系数和极限承载力进行计算，并讨论桩参数对转换系数的影响规律。研究结果表明：通过将等位移法引入自平衡桩土模型，计算得到等效转换的极限承载力与堆载法计算结果误差在0.5%以内，可准确计算自平衡转换系数，且管桩桩长和桩径增大会显著提高桩基承载力，桩参数对自平衡转换系数和桩基极限承载力具有显著影响。
- 自平衡法 /
- 管桩 /
- Q-s曲线 /
- 转换系数
Abstract: Compared with traditional methods, O-cell test has unique advantages for some special sites, especially in the offshore pile foundation testing. To study the load transfer characteristics of the O-cell method for testing piles in coastal soft soil foundation, and analyze the influence of pile parameters on the conversion coefficient, this paper established the pile-soil numerical model to simulate the O-cell and traditional pile testing processes. The finite element method and equal displacement method were combined to calculate the conversion coefficient and ultimate bearing capacity, and the influence of pile parameters on the conversion coefficient was discussed. The research results indicate that the error between the equivalent conversion ultimate bearing capacity calculated by introducing the equal displacement method into the O-cell pile-soil model and the calculation results of the surcharge method is within 0.5%, and the O-cell conversion coefficient can be accurately calculated. The increase of the length and diameter of the pipe pile will significantly improve the bearing capacity of the pile foundation, and the pile parameters have a significant impact on the O-cell conversion coefficient and the ultimate bearing capacity of the pile foundation.
- O-cell test /
- pipe pile /
- Q-s curve /
- conversion coefficient

HTML全文

图 1 自平衡试桩系统构造及现场检测

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图 2 桩顶堆载法和自平衡法加载方式示意图

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图 3 自平衡桩土模型及网格（单位：m）

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图 4 自平衡试桩Q-s曲线图

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图 5 传统堆载试桩Q-s曲线图

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图 6 不同转换系数下Q-s曲线对比

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图 7 不同桩径的Q-s曲线

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图 8 桩径对自平衡转换系数的影响

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图 9 不同桩长的Q-s曲线

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图 10 桩长对自平衡转换系数的影响

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表 1 桩土计算参数

材料	杨氏模量 /kPa	泊松比	重度 /(kN·m⁻³)	黏聚力 /kPa	内摩擦角 /(°)
软黏土层	15000	0.47	18.5	80	0
砂层	150000	0.35	20	30	25
基岩	1200000	0.25	23.5	400	34
桩	35000000	0.15	25

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表 2 桩径影响分析方案

模型组	桩径 D/mm	壁厚 t/mm	桩长 L/m	荷载箱距桩底距离d/m	极限加载位移/mm	长径比
1	500	130	20	5	25	40
2	600	130	20	5	30	33.3
3	1000	130	20	5	50	20

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表 3 桩长影响分析方案

模型组	桩径 D/mm	壁厚 t/mm	桩长 L/m	荷载箱距桩底距离d/m	极限加载位移/mm	长径比
4	1000	130	12	3	50	12
5	1000	130	16	4	50	16
6	1000	130	20	5	50	20
7	1000	130	24	6	50	24

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