Reliability analysis of pile groups with different lengths in expansive soils with spatial variation considering the effect of rainfall

ZHANG Jun; TAN Xiao-hui; LIU Shan-wei; ZHA Fu-sheng; WANG Qiao

doi:10.16285/j.rsm.2025.0061

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Reliability analysis of pile groups with different lengths in expansive soils with spatial variation considering the effect of rainfall

更新时间：2026-06-25

- Reliability analysis of pile groups with different lengths in expansive soils with spatial variation considering the effect of rainfall
- Vol. 46, Issue 12, (2025)
- 作者机构：
  
  合肥工业大学资源与环境工程学院,安徽,合肥,230000
- 作者简介：
- 基金信息：
- DOI：10.16285/j.rsm.2025.0061
  CLC：
- Online First：20 December 2025，
  
  Published：2025
- 稿件说明：
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ZHANG Jun, TAN Xiao-hui, LIU Shan-wei, et al. Reliability analysis of pile groups with different lengths in expansive soils with spatial variation considering the effect of rainfall[J]. 2025, 46(12).
DOI：

ZHANG Jun, TAN Xiao-hui, LIU Shan-wei, et al. Reliability analysis of pile groups with different lengths in expansive soils with spatial variation considering the effect of rainfall[J]. 2025, 46(12). DOI： 10.16285/j.rsm.2025.0061.

摘要

群桩的可靠度分析是岩土工程中的一个热点问题，采用不同桩长的群桩可以缓解基桩之间的不均匀沉降，避免发生鞍形沉降，确保每根基桩可靠指标的一致性。提出一种降雨条件下空间变异膨胀土中变桩长群桩的可靠度分析方法。该方法利用数值模拟软件获得降雨入渗条件下土体基质吸力随深度及时间的变化规律；采用Karhunen-Loève（KL）级数展开法进行随机场的离散；通过修正的荷载传递法（load transfer method，简称LTM）分析变桩长群桩中的桩−桩和桩−土的相互作用，求解基质吸力变化对竖直荷载作用下桩的极限承载力；采用一阶可靠度方法（first-order reliability method，简称FORM）求解群桩中每根桩的可靠指标；再利用顺序组件法（sequential compounding method，简称SCM）估算群桩的系统可靠指标。参数研究表明，随着降雨强度和持续时间的增加，各基桩和群桩系统可靠指标都在降低。

Abstract

Pile groups with members of different lengths can mitigate differential settlement among foundation piles

prevent basin settlement

and ensure consistent reliability indicators across individual piles. This paper presents an approach for analyzing the reliability of pile groups with dissimilar pile lengths in spatially variable expansive soils under rainfall. The variation of soil matric suction with depth under rainfall infiltration conditions was analyzed by numerical simulation software. The Karhunen-Loève (KL) expansion method is used to discretize random fields. The pile-pile and pile-soil interactions in a pile group with dissimilar pile lengths

and the influence of the reduction of matric suction on the ultimate bearing capacity of the piles are analyzed using the modified load transfer method (LTM). The first-order reliability method (FORM) is employed to solve the reliability indices of each pile in a pile group

and the sequential component method (SCM) is adopted to estimate the reliability index of the pile group. Parametric studies show that increasing rainfall intensity and duration reduce the reliability indices of both individual piles and the pile group.

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