摘要
随着地铁和其他轨道交通工程的不断发展,新建隧道和既有邻近建筑物相互影响下的结构安全评估成为关注热点。本文基于桥梁外观检测开展既有桥梁技术状况评定,利用有限元数值模拟分析,开展新建隧道基坑开挖和桩基入侵相互影响下的结构安全评估。研究表明:既有桥梁桩基水平位移受基坑开挖影响较竖向位移敏感。最大水平变位和竖向变位均发生在桩顶位置。当桩基埋深>15 m后,随着埋深的增加,水平位移减小幅度降低。当埋深>20 m后,桩基竖向位移基本不受开挖影响。桩基入侵后新建隧道仰拱位置承载力安全系数最小,接近2.51。隧道基坑开挖和桩基入侵相互影响后,结构安全性能满足要求。
With the continuous development of subway and other rail transit engineering,the structural safety assessment of newly built tunnels and adjacent buildings under their mutual influence has become a hot topic of attention.This article evaluates the technical condition of existing bridges based on bridge appearance inspection,and uses finite element numerical simulation analysis to conduct structural safety assessment under the mutual influence of excavation of new tunnel foundation pits and pile foundation intrusion.Research has shown that the horizontal displacement of existing bridge pile foundations is more sensitive to excavation than vertical displacement.The maximum horizontal and vertical displacement occur at the top of the pile.When the burial depth of the pile foundation is greater than 15 meters,with the increase of burial depth,the reduction of horizontal displacement decreases.When the burial depth is greater than 20 meters,the vertical displacement of the pile foundation is basically not affected by excavation.After the invasion of pile foundation,the safety factor of bearing capacity at the inverted arch position of the newly built tunnel is the smallest,close to 2.51.After the mutual influence between tunnel excavation and pile foundation intrusion,the structural safety performance meets the requirements.
作者
曾小广
ZENG Xiaoguang(Jiangxi Transportation Science Research Institute Co.,Ltd.,Nanchang Jiangxi330052,China)
出处
《北方建筑》
2024年第4期116-120,共5页
Northern Architecture
基金
重庆市教委科学技术研究项目(KJQN202304301)
重庆市建设科技计划项目(城科字2023第1-10号)
重庆市自然科学基金面上项目(CSTB2022NSCQ-MSX0661)。
关键词
新建隧道
既有桥梁
安全评估
基坑开挖
new tunnel
existing bridges
security assessment
excavation of foundation pits
