摘要
文中以杭州某地铁换乘站的旁侧基坑开挖为例,研究了偏心卸载下隧道结构的纵向变形响应。基于小应变土体刚度模型,考虑到车站对隧道结构整体刚度的贡献,建立了车站-隧道-基坑的三维复杂模型。根据实际开挖工序,全过程模拟了旁侧基坑分区施工,得到了各典型工况下隧道的纵向变形结果;分析了坑隧位置关系对隧道纵向变形的影响,坑隧距超两倍挖深时隧道变形以水平位移为主,且围护结构角点对隧道纵向变形的约束效果随卸荷程度的加大而逐步减弱。
Taking the excavation of the side foundation pit of a subway transfer station as the case,we study the lon⁃gitudinal deformation response of the tunnel structure under eccentric unloading.Based on the small strain soil stiff⁃ness model,a three-dimensional complex model of the station-tunnel-foundation pit was established considering the contribution of the station to the overall stiffness of the tunnel structure.According to the practical excavation process,the construction of the side foundation pit partition is simulated,and the longitudinal deformation results of the tunnel structure are obtained.The influence of the location relationship between the pit and the tunnel on the lon⁃gitudinal deformation of the tunnel is analyzed.When the distance between the pit and the tunnel is more than twice the excavation depth,the tunnel deformation is mainly horizontal displacement,and the constraint effectiveness of the corner point of the enclosure structure on the longitudinal deformation of the tunnel is gradually weakened with the increase of the unloading degree.
作者
李俊
江昊鸿
徐超
LI Jun;Jiang Haohong;XU Chao(Institute of Architecture and Engineering,Zhejiang University,Hangzhou,310058,China;Shanghai Urban Construction City Operation(Group)Co.,Ltd.,Shanghai 200023,China)
出处
《低温建筑技术》
2024年第8期77-81,共5页
Low Temperature Architecture Technology
基金
浙江省建设厅项目(2022K073)
浙江交工协同创新联合研究中心项目(ZDJG2021001)。
关键词
旁侧基坑
纵向变形
水平位移
角点约束
side foundation pit
longitudinal deformation
horizontal displacement
corner constraint
