A NUMERICAL SIMULATION OF THE TUNNEL LINING BEHAVIOUR UNDER THE IMPACT OF HIGH TEMPERATURE DUE TO FIRES

Abstract

The fires in tunnels can cause high temperature and can seriously affect tunnel structure. Study on the work of tunnel lining under impact of high temperature is a challenge for predicting the safety as well as proposing measures to repair the structures after the fires. This study aims at analysis of stress-strain state in the tunnel lining that subjected to the large changes of temperature due to the fires. The analysis is relied on numerical simulations by finite element method with the assumptions of the plane strain problem for a deep tunnel. The thermo-hydro-mechanical coupling behavior for the lining and the surrounding medium is used in the simulation. The results obtained show that the influence of the high temperature on the stress-strain state of the lining is significant and the region of the lining near tunnel wall can be damaged.