岩土工程学报2011，Vol.33Issue(5)：705-713,9.
柔性桩承式加筋路堤桩土应力比分析
Pile-soil stress ratio of deformable pile-supported and geosynthetics-reinforced embankments
摘要
Abstract
For deformable pile-supported and geosynthetics-reinforced embankments, a load transfer model for common coordination working mechanism of embankment-net-pile-soil is established.Soil arching effect of the embankment and mutual coordination working mechanism of pile-soil are analyzed based on the modified load transfer model for embankments and the assumed distribution of skin friction on piles.According to the force equilibrium, a new formula for pile-soil stress ratios and the differential settlement between piles and soil is deduced under the coupling of soil arching effect, tensioned membrane effect and mutual coordination working mechanism of pile-soil.The model is verified through practical projects, and the relationships of the pile-soil stress ratios with correlative influence factors are analyzed.It is found that the pile-soil stress ratios will first increase and then decrease with the increase of angle of internal friction of fill, will increase with the increase of the pile modulus of compressibility and the fill modulus of compressibility, and will decrease with the increase of the soil modulus of compressibility between piles and the pile space.With the increase of the tensile strength of geo-grids, the pile-soil stress ratios on net will decrease, and those below net will increase.The latter is larger than the former, and the relative difference between them will increase with the increase of the tensile strength of geo-grids, the fill modulus of compressibility, the unit weight and the height of fill.The theoretical value of the pile-soil stress ratios and the differential settlement between piles and soil are close to the observed ones.关键词
柔性桩承式加筋路堤/桩土应力比/土拱效应/拉膜效应/桩侧摩阻力Key words
deformable pile-supported and geosynthetics-reinforced embankment/ pile-soil stress ratio/ soil arching effect/ tensioned membrane effect/ skin friction分类
交通工程引用本文复制引用
俞缙,周亦涛,鲍胜,蔡燕燕..柔性桩承式加筋路堤桩土应力比分析[J].岩土工程学报,2011,33(5):705-713,9.基金项目
重庆交通大学(桥梁)结构工程重点实验室开放基金项目(CQSLBF-Y11-2) （桥梁）
中国矿业大学深部岩土力学与地下工程国家重点实验室开放基金项目(SKLGDUEK1012) （SKLGDUEK1012）
泉州市科技计划项目(2010281) （2010281）
华侨大学基本科研业务费专项基金资助(JB-ZR1123) （JB-ZR1123）
