基坑开挖对邻近地铁变形的实时监测与数值分析

Numerical Simulation and Real Time Monitoring of Foundation Pit Excavation on Deformation of Adjacent MRT Tunnels

基坑开挖会使临近隧道产生位移与不可忽视的自身结构变形,影响隧道的运行安全。论文借助有限元方法与现场自动监测,对基坑开挖对临近已建隧道的影响展开研究,采用数值模型对实际施工工况进行模拟,动态地分析了施工过程中开挖卸荷对地铁隧道的影响。分析表明基坑开挖对隧道不仅产生了纵向上的沉降,也使隧道结构本身产生了一定的横向变形,现场实测数据与有限元分析结果对比反映了隧道变形的规律。可以为以后的工程提供参考。

Rapid urban development in cities often requires basement excavation close to or directly above existing tunnels.Some reports of correlative projects have indicated that an excavation may induce displacement and deflection on tunnel lining and affect the serviceability and safety of the tunnel.The research in this paper aims to investigate the influence factors by means of the finite element and TM30 automatic monitoring system,the model simulated the practical construction process and then dynamically analyzed the affection of excavating on metro tunnel.Field data show that excavation on tunnel has caused a longitudinal deformation and convergence as well.The field data and finite element analysis results presented the evolution of deformation of tunnel with the deep excavation.It is hoped to be reference to the similar projects.