摘要
基于自主研制的物理模型试验装置,开展了桩承式路堤桩土荷载分担特性试验。通过模拟桩土差异沉降形成过程,分析了不同填土高度下桩承式路堤应力分布变化特性,并阐明了桩土应力传递规律。研究结果表明:桩间土上方路堤自重传递至桩顶,进而导致桩间土的竖向土压力减小,桩顶土压力增加。随着桩土差异沉降增加,桩土应力比变化呈现出先快速增加、后略有减小、最后趋于稳定的变化趋势。路堤填土高度越大,最终稳定状态的桩土应力比越大。试验研究成果可为桩承式路堤工程设计提供理论支持。
Based on the self-developed physical model test device,the model tests on the load-sharing characteristics of piles and soils in pile-supported embankment are carried out.Through the formation process of the differential settlement between the piles and the soils,the stress transfer laws of pile-soil under different fill heights are studied and clarified.The results show that the partial weight of the embankment above the soils between the piles transfers to the pile top so as to lead to the decrease of the vertical pressure between the piles and the increase of the pressure at the pile top.With the increase of the differential settlement between the piles and the soils,the change of pile-soil stress ratio shows a trend of rapid increase at first,then a slight decrease,and finally tends to be stable.Furthermore,with the increase in the height of embankment fill,the stable value of pile-soil stress ratio becomes large.The experimental results may provide a theoretical support for the design of pile-supported embankment.
作者
吕玺琳
庞博
朱长根
张甲峰
徐柯锋
马泉
LÜ Xi-lin;PANG Bo;ZHU Chang-gen;ZHANG Jia-feng;XU Ke-feng;MA Quan(Department of Geotechnical Engineering,Tongji University,Shanghai 200092,China;Shaanxi Key Laboratory for the Property and Treatment of Special Soil and Rock;Shanghai Baoye Group Co.,Ltd.,Shanghai 200941,China;Shanghai CAAC New Era Airport Design&Research Institute Co.,Ltd.,Shanghai 200335,China)
出处
《岩土工程学报》
EI
CAS
CSCD
北大核心
2022年第S02期50-53,共4页
Chinese Journal of Geotechnical Engineering
基金
国家重点基础研究发展计划项目(973)青年科学家专题项目(2014CB049100)
广西重点研发计划项目(AB22080032)
关键词
桩承式路堤
差异沉降
模型试验
桩土应力比
pile-supported embankment
differential settlement
model test
pile-soil stress ratio
作者简介
吕玺琳(1981—),男,教授,主要从事岩土力学与工程方面研究工作。E-mail:xilinlu@tongji.edu.cn。
