摘要
该文依托杭州地铁江汉路站附属结构基坑邻近大盾构隧道工程,基于双基坑平行盾构隧道开挖的三维数值模型,探究基坑开挖引起的隧道水平和竖向位移变化规律,并开展不同相对距离、相对埋深等位置因素的敏感性分析。结果表明:随着双基坑的开挖,隧道近基坑侧应力释放,导致隧道向坑底方向逐渐偏移,整体呈“扁鸭蛋”型变形,且基坑开挖引起的隧道的竖向变形大于水平变形;隧道距离基坑越近变形越大,当水平距离超过3倍开挖深度时,基坑开挖卸荷影响可忽略;随隧道埋深的增加,其变形呈现先增大后减小的趋势,在隧道埋深为2倍开挖深度时,隧道变形达到最大值。
This study is based on the project of the auxiliary structure foundation pit of Jianghan Road Station adjacent to a large shield tunnel in Hangzhou Metro,and estabilish a three-dimensional numerical model of double foundation pit excavation parallel to the shiled tunnel to investigate the variation characteristics of the horizontal and vertical displacements of the tunnel caused by the excavation,and conduct sensitivity analysis of positional factors such as different relative distances and relative burial depths.The results show that with the excavation of double foundation pits,the side stress on the tunnel adjacent to the foundation pit is released,causing the tunnel to gradually shift toward the bottom of the pit.The overall deformation of the tunnel resembles a“flatened ellipsoid”,and the vertical deformation of the tunnel caused by the excavation of the foundation pit is greater than the horizontal deformation.The closer the tunnel is to the foundation pit,the greater the tunnel deformation.When the horizontal distance exceeds 3 times the excavation depth,the unloading effect of the excavation of the foundation pit can be neglected.As the burial depth of the tunnel increases,the tunnel deformation first increases and then decreases.When the burial depth reaches twice the excavation depth,the deformation of the tunnel reaches its maximum value.
作者
方利泽
黄家晟
罗敏敏
Fang Lize;Huang Jiasheng;Luo Minmin(The Architectural Design and Research Institute of Zhejiang University Co.,Ltd.)
出处
《勘察科学技术》
2025年第4期54-60,共7页
Site Investigation Science and Technology
关键词
基坑
盾构隧道
三维数值分析
影响因素
foundation pit
shield tunnel
three-dimensional numerical analysis
influencing factors
