Abstract
This paper studies the impact of overhead excavation on an existing tunnel through both field monitoring and a full 3D numerical model. It is found that the excavation induced longitudinal heave of the tunnel is uneven with maximum heave occurring below the excavation center. Even at the same cross section, the excavation induced heave is not uniform with the most significant heave occurring at the tunnel crown. The bending moments of the tunnel lining is decreased due to the overhead excavation. The axial forces of the tunnel lining generally decrease except at the tunnel invert. The shear forces of the tunnel increase substantially. The excavation induced tunnel deformation and internal forces may reduce the effectiveness of the waterproof system.
| Original language | English |
|---|---|
| Pages (from-to) | 63-81 |
| Number of pages | 19 |
| Journal | Computers, Materials and Continua |
| Volume | 34 |
| Issue number | 1 |
| Publication status | Published - 19 Dec 2013 |
Keywords
- Deformation
- Excavation
- Internal forces
- Monitoring
- Shield tunnel
ASJC Scopus subject areas
- Biomaterials
- Modelling and Simulation
- Mechanics of Materials
- Computer Science Applications
- Electrical and Electronic Engineering