Application of fiber-reinforced concrete lining for fault-crossing tunnels in meizoseismal area to improving seismic performance

Abstract

The fault-crossing tunnel in meizoseismal area is directly subjected to strong ground motion, which leads to the failure of the tunnel lining. In order to improve the seismic safety of tunnel, fiber-reinforced concrete is applied to tunnel lining in this article. Taking the section of Zhongyi tunnel crossing Wanlong fault as an example, seismic performance of fiber-reinforced concrete tunnel lining was studied by finite difference numerical calculation software FLAC3D. The seismic displacement, stress response, and side wall convergence of secondary lining structures which are plain concrete, steel fiber-reinforced concrete, and steel-basalt hybrid fiber-reinforced concrete were comparatively analyzed. Moreover, the safety factor of each lining structure was investigated with the present numerical model. With the obtained data, seismic performance of steel-basalt hybrid fiber-reinforced concrete secondary lining is better than that of steel fiber-reinforced concrete secondary lining. The results may provide references for seismic design of fault-crossing tunnels in meizoseismal area.

Study on Spraying Construction Method of a Non-Water Reacting Polymer Layer in the Tunnel

“…The construction of a damping layer in the tunnel is an important damping measure. The common damping materials in the existing research include rubber plate [3], foam concrete [4,5], fiber concrete [6], polymer composite [7], etc. However, the above materials have the defects of temperature sensitivity, poor durability and low preparation efficiency, and there are few reports on their construction technology.…”