Damage Analysis For Railway Tunnel Lining Due To Fire Disaster

This thesis studies the damage to the lining of railway tunnels after a fire disaster.The influences of the changes in the temperature and duration of the fire in the combustion zone on the temperature,stress,strain,displacement and damage of the tunnel lining at different angle positions are analyzed by using the numerical simulation method.The conclusions are as follows: on the cross-section of the tunnel in the combustion zone,the temperature,stress,strain,and displacement of the lining surface are related to their positions,(1)When the angle between the position of the lining surface and the horizontal plane is 0°,the temperature is the lowest and when the angle is 90°,the temperature is the highest.When the angle exceeds 76°,the temperature of the lining surface exceeds 800°C.(2)When the angle exceeds 30°,the displacement of the lining surface increases sharply.When the angle is 90°,the temperature is 1200°C and the displacement is the largest.(3)The compressive stress of the lining increases with the increased angle.Considering the deterioration of the strength of the concrete material,the lining will be cracking and spalling.(4)The duration of fire has a certain influence on the stress,strain,and damage of concrete.