Research on Seismic Performance of Fiber Concrete Lining Structure of Urban Shallow-Buried Rectangular Tunnel in Strong Earthquake Area

Abstract

Due to the space utilization and support requirements of shallow-buried rectangular tunnel in city, special treatment is needed for lining structure. More stable structure should be taken to prevent the influence of strong earthquake on the rectangular section of tunnel. ABAQUS finite element model was established to clarify the influence of fiber-reinforced concrete lining structure on the seismic performance of urban shallow-buried rectangular tunnel. Based on the design and engineering conditions, firstly C25 concrete was applied as lining structural materials. Then, the seismic effects of steel fiber concrete (SFRC) and steel-basalt hybrid fiber concrete (SBHFRC) as the lining structure are compared and analyzed. The influence of internal force is studied and compared by calculating the safety factors of the tunnel lining structure under the above three conditions. The results show that the seismic performance of the lining structure using SFRC is better than that of using SBHFRC. The results have important reference value for the seismic fortification design and related research of urban shallow-buried rectangle tunnels in strong earthquake area.