摘要
南宁市某基坑采用“两墙合一”双环形支撑体系,为研究基坑开挖工况下地下连续墙及坑外浅基础建筑物的变形特性,基于现场监测资料,对基坑开挖引起的临近建筑物沉降、地连墙顶水平位移、竖向位移以及地连墙墙体侧向位移进行了系统分析。分析结果表明:周边建筑物沉降受其高度、基础形式、埋深、距基坑距离以及与基坑相对位置等因素的影响程度较大;地连墙竖向变形受基坑开挖暴露时间以及临近建筑物的影响较大,其最大竖向位移VWY变化区间为(-0.088%~0.083%) He(He为开挖深度);近建筑物段地连墙侧移呈现为“内凸悬臂复合式”变形形态;“坑角效应”导致位于坑角处的地连墙呈现出“阶梯内凸式”变形形态;地连墙的最大侧移变化区间为(0.02%~0.21%)He,平均值为0.085%He。
To study the influence of excavation with a double ring bracing system on the deformation behavior of the dia-phragm wall and shallow foundation building outside the pit under the condition of“two walls combined into one”.Taking a founda-tion pit project in Nanning city as an example,the settlement of adjacent buildings,the horizontal and vertical displacements of the top of the diaphragm wall,and the lateral displacement of the diaphragm wall caused by the foundation pit excavation were studied by us-ing the site monitoring data.The results show that the settlement of a building was greatly affected by its height,foundation form,bur-ied depth,and distance from the foundation pit.The vertical deformation of the diaphragm wall was greatly affected by the exposure time of foundation pit excavation and adjacent buildings.The maximum vertical displacement of the diaphragm wall,VWY,varies between–0.088%~0.083%He(where He is the excavation depth).The adjacent part of the diaphragm wall lateral movement presents a“convex cantilever compound”deformation form;Due to the effect of the pit angle,the diaphragm wall at the pit angle presents a“stepped convex”deformation form.The maximum horizontal displacement range of the underground diaphragm wall was 0.02%He~0.21%He,and the average horizontal displacement of the diaphragm wall was 0.085%He.
作者
周尧
苗向光
廖文智
江杰
张鹏
Zhou Yao;Miao Xiangguang;Liao Wenzhi;Jiang Jie;Zhang Peng(China Railway Construction Group Southern Engineering Co.,Ltd.,Nanning 530000,Guangxi,China;College of Civil Engineer-ing and Architecture,Guangxi University,Nanning 530004,Guangxi,China)
出处
《岩土工程技术》
2023年第6期669-675,共7页
Geotechnical Engineering Technique
基金
国家自然科学基金资助项目(52068004)
广西重点研发计划项目(AB19245018)。
关键词
基坑开挖
两墙合一
建筑物沉降
双环形支撑
foundation pit excavation
two walls combined into one
building settlement
double annular internal support
作者简介
周尧,男,1988年生,瑶族,广西灵川人,大学本科,工程师,主要从事工程管理工作。E-mail:1943303498@qq.com;通讯作者:江杰,男,1979年生,汉族,湖北麻城人,博士,教授,主要从事复杂受力环境的桩基础理论与应用方面的教学与研究工作。E-mail:jie_jiang001@126.com。
