摘要
高效平稳下沉是大跨度桥梁沉井基础施工下沉的目标。以张靖皋长江大桥北航道桥北锚碇陆地大型沉井基础工程为背景,为确保大型沉井在下沉过程中的安全和稳定,针对下沉过程中五种典型工况,采用三维有限元分析方法,详细分析了各工况沉井结构的变形和应力特征,并结合沉井下沉系数,确定了不同工况对应的沉井下沉系数值,可用于指导沉井基础施工。计算结果表明:沉井基础在五种典型工况下的变形和应力特征均在设计许可范围内,同时与以往采取一个阶段过程的下沉系数计算相比,根据具体工况计算的下沉系数更能够反映当前状态下沉井接高及下沉后的安全和稳定,可为沉井基础的设计和施工提供有力的技术支撑。
An efficient and stable sinking is the goal of the sinking large-span bridge caisson foundations during the construction.This paper presents a case history of a foundation project of the large caisson on the north anchorage of the Zhangjinggao Yangtze River Bridge.In order to ensure the safety and stability of the large caisson during the sinking process,a three-dimensional finite element analysis method was used to analyze the deformation and stress characteristics of the caisson structure under five typical working conditions.Combined with the caisson sinking coefficient,the corresponding caisson sinking coefficient values for different specific working conditions were determined,it can be used to guide the construction of caisson foundations.The analytical results indicate that the deformation and stress characteristics of the caisson foundation under five typical working conditions are within the design permission range.At the same time,compared with the previous estimation of the settlement coefficient using a one-stage process,the settlement coefficient estimated based on the specific working conditions can better reflect the safety and stability of the caisson foundation after being elevated and sunk under the current state,providing strong technical support for the design and construction of the caisson foundation.
作者
杨智
郭明伟
徐安
蒋凡
YANG Zhi;GUO Mingwei;XU An;JIANG Fan(School of Civil Engineering and Architecture,Anhui University of Science and Technology,Huainan 232001;State Key Laboratory of Geomechanics and Geotechnical Engineering,Institute of Rock and Soil Mechanics,Chinese Academy of Sciences,Wuhan 430071;University of Chinese Academy of Sciences,Beijing 100049;China Railway Bridge and Tunnel Technology Co.Ltd,Nanjing 210061)
出处
《土工基础》
2024年第1期51-56,共6页
Soil Engineering and Foundation
关键词
沉井基础
有限元
下沉系数
技术支撑
Caisson Foundations
Finite Element Analysis
Sinking Coefficient
Technical Support
