基于改进多层压实法的沉桩施工离散元分析
Discrete element analysis of pile driving construction based on improved multi-layer compaction method
张云鹤 1徐益飞 1肖春红 1杨体旺1
作者信息
- 1. 四川省交通勘察设计研究院有限公司,四川 成都 610017;交通运输部 BIM技术应用行业研发中心,四川 成都 610017
- 折叠
摘要
为从细观层面深入研究沉桩施工对地基土位移及应力的影响规律,对地基土的细观参数进行标定并利用离散元法开展沉桩施工数值模拟.研究结果表明:沉桩会导致桩周土体侧移和隆起.随着沉桩深度的增加,桩周土体隆起范围不断扩大,地基土中的接触力以及桩端阻力均不断增大,且增长速度先快后慢.沉桩施工对桩周土体的横向应力影响较大,最大横向应力出现位置与沉桩深度密切相关.随着地基土与桩体水平距离的增大,沉桩施工对桩周土体竖向应力的影响逐渐减弱.研究成果为桩基础工程施工与离散元模拟提供参考.
Abstract
To investigate the influence of pile driving construction on the displacement and stress of foundation soil from a micro-scale perspective,the micro-parameters of foundation soil were calibrated,and a numerical simulation of pile driving construction was carried out using the discrete element method.The study results indicate that pile driving causes lateral displacement and bulging of the soil around the pile.As the pile driving depth increases,the extent of soil bulging around the pile continues to expand,and both the contact force within the foundation soil and the resistance at the pile end increase,with the growth rate being fast initially and then slowing down.Pile driving construction significantly impacts the lateral stress of the soil around the pile,with the location of the maximum lateral stress being closely related to the pile driving depth.As the horizontal distance between the foundation soil and the pile increases,the influence of the pile sinking construction on the vertical stress of the soil around the pile is gradually weakened.The research results provide reference for pile foundation construction and discrete element simulation.
关键词
软土地基/沉桩施工/应力分布/离散元/桩端阻力Key words
soft foundation/pile driving construction/stress distribution/discrete element method/pile end resistance引用本文复制引用
出版年
2024
国家科技期刊平台
NSTL
万方数据