大尺寸三角形基坑变形特性的现场试验研究  

Field Investigation of Deformation Characteristics of Large-scale Triangular Deep Excavation

作　　者：杨佳岩 余文瑞 丁楚 陈丽 YANG Jiayan;YU Wenrui;DING Chu;CHEN Li(China Harbour Engineering Company Limited,Beijing 100027,China;CCCC Fourth Highway(Beijing)Highway Test Checking Technology Co.,Ltd.,Beijing 100025,China;Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering,Hohai University,Nanjing,Jiangsu 210024,China;Laboratory of Quality Control of Engineering Projects in Zhenjiang New District,Zhenjiang,Jiangsu 212132,China)

机构地区：[1]中国港湾工程有限责任公司,北京100027 [2]中交四公局(北京)公路试验检测科技有限公司,北京100025 [3]河海大学岩土力学与堤坝工程教育部重点实验室,江苏南京210024 [4]镇江新区建设工程质量中心试验室,江苏镇江212132

出　　处：《水利与建筑工程学报》2020年第1期146-151,共6页Journal of Water Resources and Architectural Engineering

摘　　要：依托上海软黏土地层的某大尺寸三角形深基坑工程,通过开展现场试验,对基坑施工过程中的地下连续墙的侧向变形、地表沉降进行了监测,并对监测数据进行了系统分析。监测结果分析表明:不同于矩形基坑,大尺寸三角形基坑连续墙顶部的水平位移约为其最大水平位移的40%~70%;深基坑开挖结束后,拆除混凝土支撑产生的附加水平位移约为基坑开挖引起的墙体水平位移的30%~40%;三角形深基坑开挖引起的最大连续墙水平位移介于0.05%H^0.35%H(开挖深度)之间,大于矩形和圆形深基坑引起的连续墙变形。这主要是因为三角形基坑的内支撑不能同时垂直于支撑两端的地下连续墙。深基坑的端部约束效应导致地下连续墙呈现出明显的三维变形特性,基坑中部墙体的水平位移明显大于两端位移。Based on a large-scale triangular deep basement constructed in Shanghai soft clay, the horizontal displacement at the top of the diaphragm wall and surface settlement during construction are monitored by field tests. Unlike rectangular basements, horizontal displacement at the top of the diaphragm wall of large-scale triangular basement pit is about 40%~70% of its maximum horizontal displacement. After removing concrete props, horizontal displacement of retaining wall increased by 30%~40%. Upon completion of basement excavation, the maximum horizontal wall displacement of the large-scale triangular basement is in a range of 0.05%H^0.35%H(excavation depth), which is obviously larger than that of rectangular and circular basements. This is mainly because horizontal props cannot be installed perpendicular to retaining walls of triangular basement. Due to obvious corner effects, retaining wall presents obvious three-dimensional deformation characteristics(i.e., horizontal displacement in the middle of the wall is obviously larger than that at both ends).

关 键 词：大尺寸 三角形深基坑 水平位移 沉降 现场试验 

分 类 号：TU441[建筑科学—岩土工程]