摘要
为研究矩形基坑几何效应及基坑缺角对于基坑变形特性的影响,文中以汕头某扩建项目矩形深基坑工程为例,通过现场实测数据,研究了矩形基坑几何效应对于基坑周边地表沉降和围护桩水平位移影响,分析了基坑在时间上和空间上的变形规律和影响因素。结果表明地表沉降随基坑开挖工况的进行不断增大,以向下沉降变形为主;围护桩水平位移随时间不断增大,且沿围护桩埋置深度方向呈现出先增大后减小的抛物线型变形规律,存在一段明显鼓起处;矩形基坑缺角处更为薄弱,由于矩形基坑缺角产生几何效应影响,造成围护桩侧向位移和地表沉降在缺角处更为显著。研究结果可为同类型基坑开挖和设计提供参考。
This paper studies the rectangular pit geometry effect and the influence of pit notch on pit deformation characteristics,taking the rectangular deep foundation pit project of an extension project in Shantou as the case,the geometric effect of rectangular foundation pit on the surface settlement around the foundation pit and the horizontal displacement of the enclosing piles is studied through the field measurement data,and the deformation pattern and influencing factors of the foundation pit in time and space are analysed.The results show surface settlement in⁃creased with the pit excavation conditions with downward settlement deformation dominating.Horizontal displace⁃ment of the enclosing piles increases with time,which shows a parabolic deformation pattern of increasing and then decreasing along the direction of the depth of the enclosing piles'burial with a section of obvious bulge.Due to the influence of geometric effects of rectangular pit corners,rectangular pit corners are weaker than that of others,resulting in lateral displacement of the perimeter piles and surface settlement is more significant at the corners.The re⁃sults of the study may provide the reference for the excavation and design of the same type of pit.
作者
李泉
LI Quan(Shanghai Engineering Construction Consulting and Supervision Co.,Ltd.,Shanghai 200433,China)
出处
《低温建筑技术》
2024年第3期168-172,共5页
Low Temperature Architecture Technology
关键词
矩形深基坑
围护桩水平位移
几何效应
rectangular deep foundation pit
horizontal displacement of the retaining pile
geometric effect
