地铁站深基坑逆作法施工过程地下室结构与毗邻基础的相互影响  

Interaction of Basement Structure and Surrounding Building Foundation during Deep Metro Station Excavation by Top-Down Method

作　　者：王丽[1,2] 杨文彬[2] 武钰翔 郑刚[1] 

机构地区：[1]天津大学建筑工程学院,天津300072 [2]大连交通大学土木与安全工程学院,辽宁大连116028

出　　处：《大连交通大学学报》2016年第4期85-90,117,共7页Journal of Dalian Jiaotong University

基　　金：国家自然科学基金资助项目(51208071)

摘　　要：在反演分析得到的参数基础上研究地铁站基坑逆作法施工过程中基坑地下室结构与临近桩基础和浅基础的相互影响.当基坑周边有浅基础时,当其他条件相同时,随着浅基础与基坑的距离增加、基础埋深增加、基础宽度增加,基坑开挖引起的浅基础中心点的沉降量逐渐减小;随着浅基础埋深增加,浅基础与基坑距离增加,开挖引起的挡土墙和桩柱上部（0～28 m）侧移减小;浅基础宽度变化对挡土墙和桩柱侧移影响不大.当基坑周边有桩基础时,当桩基础与挡土墙之间的距离相同时,桩长越长,桩基础受到基坑开挖导致的土体回弹影响越大;桩基础的存在对挡土墙的墙身侧移影响很小;在浅基础及桩基础各工况中,开挖引起的坑内桩柱及挡土墙的回弹十分接近,开挖引起的挡土墙土压力沿深度分布也十分接近.The top-down excavation of Metro Line 10 in Shanghai is modeled with finite element analysis soft ware ABAQUS , and the parameters of subsoil are obtained by inverse analysis. Based on the finite elementmodels and parameters, interaction of basement structure and surrounding building foundations during topdownexcavation is discussed in detail. If the shallow foundation is close to the pit,settlement at the middle ofshallow foundation is decreased when the distance between shallow foundation and pit, the burying depth ofshallow foundation and the width of shallow foundations is increased. W h e n burying depth of the shallow foundationand the distance between shallow foundation and pit are increased, the deflection caused by pit excavationalong top part of the diaphragm wall, column and pile ￡ire decreased. Deflections of the diaphragm wall,column and pile do not change with the shallow foundation width . If pile foundation is close to the pit, thelonger pile length results in the greater effect of soil rebound on pile foundations. Effect of pile foundation ondiaphragm wall deflections can be neglected,and the deflection of diaphragm wall does not change with pilelength. In all cases of pile and shallow foundations, rebounds of inner column and diaphragm wall ￡ire veryclose, and so does the soil pressure along diaphragm wall.

关 键 词：逆作法 浅基础 桩基础 地下连续墙 地铁站深基坑 

分 类 号：U231.3[交通运输工程—道路与铁道工程]