3D-Nonlinear Finite Element Analysis of Staged Shield-driven Tunnel Excavation with a Focus on Response of Segmental Tunnel Linings
The complex and dynamic nature of shield-driven tunnel excavation, staged construction, segmental lining installation process, and tail-void grouting necessitate using detailed numerical modeling for predicting ground behavior and response of segmental lining. In this paper, results of three-dimensional advanced finite element modeling using DIANA program are presented simulating shield-driven tunnel excavation in one of major ongoing construction projects in the North America. A stage-based analysis is adopted to simulate mechanized tunneling procedure. Time-histories of critical responses are obtained and discussed for each stage as excavation progresses. In addition, results of three analysis cases considering different joint models, i.e. rigid joints, perfect hinge joints, and Janssen joints are discussed and compared.