The uplift response of rectangular tunnel in liquefiable soil
Zheng Gang1,2 Yang Pengbo1,2 Zhou Haizuo1,2 Zhang Wenbin1,2
1. School of Civil Engineering, Tianjin University, Tianjin 300072, China;
2. State Key Laboratory of Hydraulic Engineering Simulation and Safety, Tianjin University, Tianjin 300072, China
Abstract：The structures are prone to floating in liquefied soil during earthquake. Previous studies most focused on the uplift of circular tunnels. In this paper, based on the finite difference method FLAC2D, a model is established which can fully consider the coupling interaction between rectangular tunnel and soil, and can reflect the change of pore pressure. The variation of excess pore pressure, acceleration response, uplift displacement and deformation of soil surrounding the structure are analyzed. The influence of buried depth, section area and aspect ratio of rectangular tunnel structure on the uplift displacement are also discussed. Formulas are developed to evaluate the floating displacement of rectangular tunnel, which can provide guideline for similar projects.
