富水含砂软土地层施工对邻近桥梁影响分析
Analysis on Impact of Construction in Water-rich Sand Soft Soil Stratum on Adjacent Bridges
汪小南 1李立岩 2裴启涛3
作者信息
- 1. 武汉市城市建设投资开发集团有限公司,湖北武汉 430000;武汉市政工程设计研究院有限责任公司,湖北武汉 430023
- 2. 武汉市市政建设集团有限公司,湖北武汉 430023
- 3. 武汉市政工程设计研究院有限责任公司,湖北武汉 430023
- 折叠
摘要
针对深厚软土地层、高承压水等不利条件下的基坑开挖及顶管施工对邻近桥梁结构影响问题,以邻近武汉常青路高架桥梁某电力通道工程施工为背景,构建了三维数值分析模型,系统分析了基坑开挖及顶管施工对高架桥梁结构位移及受力的影响.研究表明:基坑开挖及顶管施工引起的桥梁结构最大水平向、竖向位移分别为1.31 mm、1.13 mm,桥梁结构最大轴力、桥桩弯矩分别为6 694.4 kN、263.3 kN·m,施工前后轴力累计变化率为-1.79％,弯矩累计变化率为1.35％,桥梁结构受力变化较小,均在规范限值以内,表明本工程设计方案是可行的、合理的.设计方案和研究成果可为邻近桥梁结构安全施工提供支撑.
Abstract
Aiming at the impact of foundation pit excavation and pipe jacking construction on adjacent bridge structures under the unfavorable conditions of deep soft soil stratum and high confined water etc.,taking the construction of an electric power passage project near the elevated bridge of Changqing Road in Wuhan as the background,a 3-D numerical analysis model is constructed to systematically analyze the impact of foundation pit excavation and pipe jacking construction on the displacement and stress of the elevated bridge structure.The results show that the maximum horizontal and vertical displacements of the bridge structure caused by foundation pit excavation and pipe jacking construction are 1.31 mm and 1.13 mm respectively.Also,the maximum axial force of bridge structure and the bending moment of the bridge pile are 6 694.4 kN and 263.3 kN·m.The accumulative change rate of axial force and the bending moment before and after construction are-1.79％and 1.35％respectively.The stress variation of the bridge structure is relatively small,both within the specification limits,which indicates that the design scheme of this project is feasible and reasonable.The design scheme and research results can provide support for the safe construction of adjacent bridge structures.
关键词
富水含砂/基坑开挖/顶管施工/桥梁/数值分析Key words
water-rich sand/foundation pit excavation/pipe jacking construction/bridges/numerical analysis引用本文复制引用
出版年
2024
NETL
NSTL
万方数据