The Numerical Simulation And Research On The Excavation Process Of Tunnel Transition Section

In this paper, based on the project-research on selection of excavation scheme used in Qingdao tunnel, with the use of numerical simulation and on-site monitoring. Firstly, the form of support usually used for underground engineering will be classified and simulation of the action of mechanics will be analyzed. Secondly, three different simulation schemes of the construction for Tongan station are proposed. The surface subsidence, Arch-top subsidence, tunnel deformation, differential settlement of buildings and so on will be analyzed though comparing. On this basis, the regularity of deformation will be analyzed. The main results are as follows:1. Though summarizing the form and mechanical effects of support usually used for underground engineering, the common simulation methods of support will be summarized.2. Though numerical simulation of three excavation methods for Tongan station, the best method for excavation of Tongan station can be chosen.3. Though numerical simulation of three excavation of the face spacing for Tongan station, the best method for excavation of Tongan station can be chosen.4. The deformation regularly between the excavation of shallow-buried station tunnel with large cross-section and the deformation can be received. An important reference provide to the similar projects to forecast the development trend of the deformation.