水文地质工程地质2017，Vol.44Issue(4)：41-49,9.DOI:10.16030/j.cnki.issn.1000-3665.2017.04.07
考虑桩土差异沉降影响的桩网复合地基桩土应力比分析方法
An analytical method of pile-soil stress ratio for pile-net composite foundation in consideration with the influence of pile-soil differential settlement
摘要
Abstract
The pile-soil stress ratio is an important control parameter for pile-net composite foundation design,which is affected by soil arching effect,membrane effect and pile soil interaction as well as their coupling action,therefore,a concentric arch model is firstly introduced to establish a new analysis model for soil arch effect of pile-net composite foundation considering the relationship between pile-soil differential settlement and the mobilized degree of soil arch effect,and the deformed surface of horizontal reinforcements is regarded as the combination of sphere and cylinder according to its deformation characteristics,a membrane effect analysis model which reflects the influence of pile-soil differential settlement is developed.Secondly,considering the pile-soil interaction and their differential settlement,a load-transfer analysis model of pile-net composite foundation is developed with consideration of the coupling effect among fillings,net and pile-soil reinforcement area,and then a new analysis method of pile-soil stress ratio is put forward.This method can reflect not only the influence of soil arching effect,membrane effect and pile soil interaction on pile-soil stress ratio but also the influence of pile-soil differential settlement on mobilized degree of soil arching effect and membrane effect as well as pile soil interaction.Finally,the feasibility and rationality of the analysis method in this paper are verified through calculation of practical engineering examples and comparison with other existing similar methods.关键词
桩网复合地基或路基/桩土应力比/土拱效应/拉膜效应/桩土相互作用/桩土差异沉降Key words
pile-net composite foundation or subgrade/pile-soil stress ratio/soil arching effect/membrane effect/pile soil interaction/pile-soil differential settlement分类
建筑与水利引用本文复制引用
曹文贵,余林芳,张超,李鹏..考虑桩土差异沉降影响的桩网复合地基桩土应力比分析方法[J].水文地质工程地质,2017,44(4):41-49,9.基金项目
国家自然科学基金项目资助(51378198) （51378198）
高等学校博士学科点专项科研基金项目资助(20130161110017) （20130161110017）
