港口航道与近海工程2024，Vol.61Issue(1)：80-86,7.DOI:10.16403/j.cnki.ggjs20240116
地基预压对桩基承载性状影响分析
Analysis for Effect of Preloading Subgrade on Bearing Behaviors of Piles
蔡晨雨 1苏俊剑1
作者信息
- 1. 中交上海航道勘察设计研究院有限公司,上海 200120
- 折叠
摘要
Abstract
A 3D nonlinear finite element model is built for super-long pile driven into stratified soil under the interaction of soil and pile.The criterion of Mohr-Coulomb is selected as the constitutive model of soil mass.Furthermore,the model can reflect the actual working state by setting the calculation domain,geostress equilibrium and boundary conditions.The model is verified accurate by comparing with the experimental results.The vertical load of mono-pile is calculated under the condition of preloading subgrade.Pile lateral friction obviously increases with the increment of soil stress around the pile after preloading subgrade,thus the pile bearing capacity increases.But the increase of pile lateral friction by preloading is limited by soil properties,and the pre-load generally weakens with the increased depth.A vertical load of 3×3 pile cluster is simulated under the condition of preloading subgrade based on mono-pile model.The area and load of the preloading subgrade can be changed to study such properties of super-long pile cluster as the bearing capacity,Q-S curve of pile top and pile lateral friction under vertical load.关键词
桩/地基预压/承载性状/桩侧摩阻力/数值模拟Key words
piles/preloading subgrade/bearing behavior/pile lateral friction/numerical simulation分类
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蔡晨雨,苏俊剑..地基预压对桩基承载性状影响分析[J].港口航道与近海工程,2024,61(1):80-86,7.
