刚性桩复合地基沉降机理与影响因素研究  

RESEARCH ON SETTLEMENT MECHANISM AND INFLUENCE FACTORS OF RIGID PILE COMPOSITE-FOUNDATION

作　　者：杨德健[1,2] 王铁成[1] 

机构地区：[1]天津大学建筑工程学院,天津300072 [2]天津城市建设学院天津市软土特性与工程环境重点实验室,天津300384

出　　处：《工程力学》2010年第A01期150-153,163,共5页Engineering Mechanics

基　　金：天津市重点科技攻关项目(06YFSZSF04000)

摘　　要：探讨了天津软土地区刚性桩复合地基桩、土、垫层共同作用的特点,分析不同荷载作用下刚性桩复合地基桩土位移场及桩土应力比的变化规律;采用ANSYS有限元软件分析了垫层模量、桩间土模量,以及桩间距等因素对复合地基沉降变形的影响。研究表明:桩间土模量的变化对刚性桩复合地基的整体沉降量影响比较显著,复合地基的整体沉降量随桩间土体模量的增加而减小;桩间距是控制刚性桩复合地基整体沉降量的主要因素之一,地基沉降量随桩间距的减小而减小,但桩间距过小时,对减少刚性桩复合地基整体沉降量的作用并不明显。Considering the pile-soil-cushion combined action and the settlement varying regularities,this paper discussed some engineering characteristics of rigid pile composite-foundation in Tianjin soft-soil area.The varying regularities of pile and soil＇s displacement field under all sorts of loads were firstly analyzed,then,the settlement properties and their dependences on some influence factors were investigated by FEM.The influence factors considered are cushion modulus,modulus of soil between piles,and pile spacing.The settlement of rigid pile composite-foundation is found to be affected substantially by the modulus of soil between piles.The pile spacing affects the site settlement.Some measures for reducing settlement were putted forward.

关 键 词：刚性桩复合地基 沉降 影响因素 垫层 桩-土应力比 

分 类 号：TU433[建筑科学—岩土工程]