基于安全性分析的深基坑变形实测与曲线拟合方法研究  

Study on Deformation Measurement and Curve Fitting Method of Deep Foundation Excavation Based on Safety Analysis

作　　者：关祥宏[1] GUAN Xianghong(China Railway Siyuan Survey and Design Group Co.,Ltd.,Wuhan,Hubei 430063,China)

机构地区：[1]中铁第四勘察设计院集团有限公司,湖北武汉430063

出　　处：《施工技术》2020年第11期109-112,共4页Construction Technology

基　　金：中铁第四勘察设计院集团有限公司科技研究开发计划项目(2019D082)。

摘　　要：深基坑开挖中围护结构的实测侧向变形经常较设计控制值大很多,且墙体变形形状也与设计计算有一定差异,此种情况下围护结构的最大弯矩是否处于危险状态往往较难判断。除通常的经验控制及变形挠度率控制等方法外,结合苏州某地铁线典型站场深基坑支护的地下连续墙侧向变形的实测结果,寻求简单可行的多项式函数进行拟合,并根据曲线函数的曲率即可计算地下连续墙的弯矩沿地下连续墙深度的分布情况,具有较大的实际工程应用价值。In deep foundation excavation,the measured lateral deformation of retaining structure is often much larger than the design control values.The deformation shape of the wall is also different from the design calculation.In addition to the common experience control method and deformation deflection rate control method,in this case,it is difficult to judge whether the maximum bending moment of the wall is in a dangerous state.In this paper,combined with the measured results of the lateral deformation of the diaphragm wall supporting the deep foundation excavation of the typical station of Suzhou Subway line,a simple and feasible polynomial function is found for fitting.According to the curvature of the curve,the distribution of the bending moment along the depth of the diaphragm wall can be calculated.

关 键 词：深基坑 地下连续墙 监测 变形 多项式函数 曲率 弯矩 

分 类 号：TU753[建筑科学—建筑技术科学]