紧邻地铁车站超深基坑变形控制及实例分析

Deformation control and case analysis ofultra-deep excavation adjacent to subway stations

某轨道交通骡马市站为四线交叉车站,新建两线车站的基坑对既有两线车站开挖的影响较大,必须保证既有线的安全运营,确保既有结构不破坏。该工程基坑开挖过程中严格控制施工步序,采用信息化施工,新建基坑开挖对既有车站变形的控制效果总体良好,既有结构及轨道沉降均未超出目标控制值,监测结果表明,既有线轨道最大沉降约6 mm,成功实现了既有线变形控制的目标。

At the intersection station of Luomashi Line 4 of a rail transit,the foundation pit of the new two stations has a great impact on the excavation of the existing two stations.It is necessary to ensure the safe operation of the existing line and ensure that the existing structure is not damaged.The construction sequence is strictly controlled during the excavation of the foundation pit of the project.Informatization construction is adopted.The new foundation pit has a good control effect on the deformation of the existing station on the whole.The monitoring results show that the settlement of the existing structure and track does not exceed the target control value.The maximum settlement of the existing track is about 6 mm,which successfully achieves the target of deformation control of the existing line.