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山东大学学报 (工学版) ›› 2026, Vol. 56 ›› Issue (4): 145-152.doi: 10.6040/j.issn.1672-3961.0.2025.023

• 土木工程 • 上一篇    

考虑材料及几何参数不确定性的抗压桩可靠度分析

张军1,鲁鹏旭2,王伟3,刘善伟1*,谭晓慧1   

  1. 1. 合肥工业大学资源与环境工程学院, 安徽 合肥 230009;2. 中电建建筑集团有限公司, 北京 100120;3. 安徽省建设工程测试研究院有限责任公司, 安徽 合肥 230051
  • 发布日期:2026-08-12
  • 作者简介:张军(2000— ),男,安徽合肥人,硕士研究生,主要研究方向为桩基可靠度分析. E-mail:zhangjun1@mail.hfut.edu.cn. *通信作者简介:刘善伟(1993— ),男,安徽天长人,讲师,硕士生导师,博士,主要研究方向为桩基变形机理分析与边坡稳定性评价. E-mail:shanweiliu@whu.edu.cn
  • 基金资助:
    国家自然科学基金资助项目(42372302);安徽省自然科学基金青年资助项目(2508085QD122)

Reliability analysis of vertically loaded compressive piles considering uncertainties in material and geometric parameters

Zhang Jun1, Lu Pengxu2, Wang Wei3, Liu Shanwei1*, Tan Xiaohui1   

  1. Zhang Jun1, Lu Pengxu2, Wang Wei3, Liu Shanwei1*, Tan Xiaohui1(1. School of Resources and Environmental Engineering, Hefei University of Technology, Hefei, 230009, Anhui, China;
    2. Power China Construction Group Ltd., Beijing 100120, China;
    3. Anhui Construction Engineering Testing and Research Institute Co., Ltd., Hefei 230051, Anhui, China
  • Published:2026-08-12

摘要： 以非饱和土中抗压桩为研究对象,考虑材料参数不确定性以及桩身、土层几何参数不确定性,建立一种抗压桩可靠度分析方法。通过理论公式法计算桩基的极限承载力,采用改进的β方法求解非饱和土中桩侧摩阻力,采用改进的Terzaghi公式求解非饱和土中桩端阻力。基于一阶可靠度分析方法分析抗压桩的可靠度及可靠度敏感性,揭示土体材料参数以及桩长、桩径与土层厚度等几何参数不确定性对抗压桩可靠指标的影响。通过对某多层土中抗压桩工程案例的计算分析,验证本研究方法的合理性和准确性,获取抗压桩承载特性的概率分布特征、可靠指标的影响因素及变化规律。可靠度敏感性分析表明,土层厚度的不确定性对抗压桩可靠指标的影响可以忽略不计;桩身几何参数的不确定性对抗压桩可靠指标有较大影响,可靠指标随着桩身几何参数变异系数的增加而明显减小;在相同的桩身几何参数变异系数下,抗压桩可靠指标随着地下水位的升高而降低,但地下水位对可靠指标的影响程度小于桩身几何参数变异性对可靠指标的影响程度。

关键词: 抗压桩, 可靠指标, 极限承载力, 蒙特卡罗法, 不确定性

Abstract: This paper aims to establish a reliability analysis method for vertically loaded piles in unsaturated soils by considering the uncertainties in soil physic-mechanical parameters and pile-soil geometric parameters. The ultimate bearing capacity of pile foundations was calculated using theoretical formulas, where the β-method was used to determine pile side friction and Terzaghi's formula was employed to evaluate pile tip resistance. Based on the first-order reliability method, the effects of variability in soil layer thickness and pile geometric dimensions on the reliability indices of pile foundations were elucidated. The rationality and accuracy of the proposed calculation method were verified through specific case studies. Parameter analysis showed that the uncertainty in soil layer thickness had little influence on the reliability indices of pile foundations, whereas the uncertainty in pile geometric parameters had a significant impact. Under the same coefficient of variation of the pile geometric parameters, the reliability index of compression piles decreased with increasing groundwater level. However, the influence of groundwater level on the reliability index was less significant than that of the variability in the pile geometric parameters.

Key words: compressive pile, reliability index, ultimate bearing capacity, Monte Carlo Method, uncertainty

中图分类号: 

  • TU43
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