An Elastic-Plastic Finite Element Analysis on Tunnel Structures at Cycled Temperatures

An analysis is conducted The excavation and lining of a tunnel structure are analyzed with numerical calculation. Then, according to the principle of unstable heat transfer, the properties of local concrete linings of the tunnel in the condition of cycled temperatures are studiedwith elastic-plastic hybrid/ mixed finite element method. The results show that at natural temperatures, the stresses in the tunnel structure are evenly distributed. On the other hand, the cycled temperature may cause the surfaces of the linings to become plastic and pill off if unattended.