北京地铁车站深基坑复合型变形模式下坑外深层土体位移场分析  

Analysis of soil displacement fields outside deep excavations in composite deformation model of Beijing subway station

作　　者：李淑 张顶立[2] 邵运达[1] LI Shu;ZHANG Dingli;SHAO Yunda(School of Engineering,the Open University of China,Beijing 100039,China;Key Laboratory of Urban Underground Engineering,Ministry of Education,Beijing Jiaotong University,Beijing 100044,China)

机构地区：[1]国家开放大学理工教学部,北京100039 [2]北京交通大学城市地下工程教育部重点实验室,北京100044

出　　处：《北京交通大学学报》2020年第4期13-23,共11页JOURNAL OF BEIJING JIAOTONG UNIVERSITY

基　　金：国家重点研发计划(2017YFC085401);城市地下工程教育部重点实验室开放研究基金(TUE2018-03);国家开放大学“十三五”规划青年基金(G18F0031Q)。

摘　　要：在环境复杂的城市中进行深基坑开挖,精细化分析深层土体位移场,对保证周边环境的安全具有重要意义.结合21个北京地铁车站深基坑工程的实测数据,分析复合型变形模式下,坑外深层土体位移场的变化规律.结果表明:坑外深层土体竖向变形随深度的增加而改变,可分为“凹槽形”沉降区、变形过渡区和“三角形”隆起区;水平侧移可分为“大肚子形”侧移区、变形过渡区和“三角形”侧移区.坑外地表竖向沉降可分为“弓形”沉降区和“三角形”沉降区;水平侧移亦可分为“弓形”侧移区、变形过渡区和“三角形”侧移区.根据变形的大小将坑外影响范围划分为主要影响区、次要影响区和无影响区.研究成果对于判断基坑开挖对坑外建(构)筑物的影响程度具有一定的指导意义.Characteristics of soil displacement fields are worth analyzing as deep excavations are executed in metropolis with complicated environment,which is of great importance to the safety of surrounding environment.The performances of 21 deep excavation projects in Beijing subway stations are monitored in this paper,and change rule of soil displacement fields outside excavations in composite deformation model are analyzed.Results show that:The vertical deformation of deep soil changes with the increasing depth,which can be divided into“groove”settlement zone,“transition”zone and“triangular”uplift zone;the lateral displacement of deep soil can be divided into“big belly”lateral displacement zone,“transition”zone and“triangle”lateral displacement zone;the vertical settlement of ground surface can be divided into“arch”settlement zone and“triangle”settlement zone;the lateral displacement of ground surface can be divided into“arch”lateral displacement zone,“transition”zone and“triangle”lateral displacement zone;According to deformation amplitude,the influence area outside excavation fall into 3 categories:main influence area,secondary influence area and zero-influence area.Research results could provide guidance for judging influence of excavations on the surrounding structures in actual projects.

关 键 词：深基坑 深层土体变形 影响范围 北京地铁 

分 类 号：TU478[建筑科学—结构工程]