黄土地区超长桩自平衡试验中平衡点确定方法研究

兰州理工大学学报 ›› 2026, Vol. 52 ›› Issue (3): 140-146.

黄土地区超长桩自平衡试验中平衡点确定方法研究

郭想军^*1, 高军²

1.甘肃第六建设集团股份有限公司, 甘肃兰州 730030;
2.中国公路工程咨询集团有限公司, 北京 100089

收稿日期:2025-05-09 出版日期:2026-06-28 发布日期:2026-06-30
通讯作者: 郭想军(1979-),男,甘肃甘谷人,高级工程师.Email:guoxj12311@163.com
基金资助:
甘肃省青年科技基金(22JR5RA286)

Research on selection method of equilibrium point during self-balanced static load test for super-long pile under loess area

GUO Xiang-jun¹, GAO Jun²

1. Gansu Sixth Construction Group Co., Ltd., Lanzhou 730030, China;
2. China Highway Engineering Consulting Gorporation, Beijing 100089, China

Received:2025-05-09 Online:2026-06-28 Published:2026-06-30

摘要/Abstract

摘要： 为减小自平衡法平衡点确定过程中桩身侧摩阻力造成的影响,采用有限元软件建立桩-土接触模型,分析了不同黄土地基承载力、不同桩长、不同桩径条件下桩的平衡点位置.当黄土地基承载力为120 kPa、桩长为75 m、桩径为800 mm时,根据现场试验结果和二分法原理,依次选取桩身1/3、1/7、7/25、21/100、17/100作为平衡点计算节点,当选取桩身17/100作为平衡点时,上、下段桩位移分别为4、4.1 mm,结果较为合理;根据建立的有限元模型进一步拓展不同工况条件,得到了地基承载力为110~250 kPa、桩长为30~110 m、桩径为600~1 500 mm时平衡点的位置,绘制了一系列平衡点图,该图表可为自平衡法中平衡点的确定提供参考.

关键词: 桩基础, 有限元模拟, 自平衡试验, 超长桩, 平衡点

Abstract: In order to reduce the influences of side friction resistance for pile body during the determination process of equilibrium point of self-balanced method, the finite element simulation was used, the finite element model of pile-soil was established and the equilibrium point positions of pile under the different conditions of foundation bearing capacity, pile lengths and pile diameters were analyzed. When the bearing capacity of loess is 120 kPa, the pile length is 75m and the pile diameter is 800mm, the 1/3, 1/7, 7/25, 21/100 and 17/100 points of pile body are selected as the calculation nodes of equilibrium point according to the site test results and the principle of bisection method. The displacements of the upper and lower piles are 4 mm and 4.1 mm respectively when the 17/100 point of pile body is selected as the calculation node of equilibrium point, and the result is reasonable. According to the established finite element model, the equilibrium points were obtained under the different working conditions such as when the foundation bearing capacity increases from 110 to 250 kPa, the pile length increases from 30 to 110 m, and the pile diameter increases from 600 to 1 500 mm, a series of equilibrium diagrams were drawn. Equilibrium diagrams can provide a reference for the determination equilibrium point in the self-balancing method.

Key words: pile foundation, finite element simulation, self-balancing test, extremely long piles, equilibrium point

中图分类号:

TU4731

郭想军, 高军. 黄土地区超长桩自平衡试验中平衡点确定方法研究[J]. 兰州理工大学学报, 2026, 52(3): 140-146.

GUO Xiang-jun, GAO Jun. Research on selection method of equilibrium point during self-balanced static load test for super-long pile under loess area[J]. Journal of Lanzhou University of Technology, 2026, 52(3): 140-146.

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链接本文: https://journal.lut.edu.cn/CN/

https://journal.lut.edu.cn/CN/Y2026/V52/I3/140

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