摘要
深基坑开挖会对周围结构变形和安全性产生一定影响,以宿州市某顶管护涵接收井深基坑开挖工程为背景,通过三维弹塑性有限元数值仿真分析深基坑开挖对邻近运营铁路以及运营铁路列车荷载对基坑围护结构变形的影响。研究结果表明:(1)基坑开挖引起的最大位移(7 mm)位于铁路路基顶面中心线附近,且随着基坑的开挖使得铁路路基产生向基坑方向整体偏移的趋势;(2)基坑右侧围护结构的水平位移明显大于左侧,其变形特征呈内凸型,且越靠近铁路路基位移越大,最大水平位移位于埋深4~8 m;(3)列车荷载会进一步加剧基坑围护结构的变形,随着二者之间距离的增加,其影响性逐渐减小。该研究结果对于类似工程具有重要的参考价值。
Deep foundation pit excavation will affect the deformation and safety of surrounding structures.Based on the deep foundation pit excavation of a pipe jacking culvert receiving well in Suzhou City,the influence of deep foundation pit excavation on adjacent operating railways and the influence of railway train load on the retaining structure of foundation pit are analyzed by finite element numerical simulation method.The results show that:(1)During the excavation of the foundation pit,the maximum displacement can reach 7 mm which located near the center line of the top surface of the railway subgrade.(2)The railway subgrade will make the horizontal displacement of the retaining structure on the right side of the foundation pit is significantly larger than that on the left side,and its deformation is convex.The maximum horizontal displacement is located near the depth between 4~8 m.The displacement of each survey line is characterized by the closer to the railway subgrade,the greater the displacement.(3)The train load will aggravate the deformation of the retaining structure of the foundation pit,but its influence range is small.At the same time,with the increase of distance,the influence effect gradually decreases.The research results could have important reference value for similar projects.
作者
朱宇
ZHU Yu(CCCC-SHEC Dongmeng Engineering Co.,Ltd.,Xi'an 710000,China)
出处
《甘肃科学学报》
2024年第2期110-116,共7页
Journal of Gansu Sciences
关键词
基坑开挖
邻近运营铁路
数值模拟
变形特征
列车荷载
Foundation pit excavation
Adjacent operating railway
Numerical simulation
Deformation characteristics
Train load
