Field Monitoring and Analysis of Envelope Pile in Shijiazhuang Six-Line Tunnel

摘要

The length of Shijiazhuang Railway six-line tunnel (Beijing-Shijiazhuang Passenger line) is 4980m, cut and cover excavation method is used widely. The width of pit is 30～52m and the depth is 8.5～22m. In order to use large machine, cable support structure is used. The west side of pit is Beijing-Guangzhou Railway. The nearest distance from pit is only 10.2m. The cable properties will change because of the train vibration. Therefore, the scope of the train vibration, vibration velocity, anchor axial force and horizontal displacement of pile are measured to get the influence of the train vibration, which can provide basic data for design and construction.