Abstract Based on the Shimian Tunnel on the Ya'an-Lugu highway, this paper analyzes the effects of the earthquake dynamic response on the tunnel face and corresponding reinforcement measures. First, it describes the main types of earthquake hazards in tunnels and the mechanical equilibrium mechanism at the working face, and performs an earthquake dynamic response analysis using FLAC3D finite difference software aiming at analyzing the effects of earthquake on stability of working faces in different strata through comparing the working face stability condition under static and dynamic action. Then it summarizes the law of extrusion deformation and confinement pressure varying with the time-history of an earthquake. Using the average plastic shear strain, extrusion deformation and confinement pressure at the working face, it evaluates the reinforcement effects on the working face. Finally, it derives the following conclusions: the tunnel working face is more likely to be destroyed by an earthquake than the tunnel lining; there are different degrees of influence of the earthquake dynamic response on the tunnel working face in various strata, that is to say, the impact is less in a rocky stratum and greater in a soil stratum; and anchor reinforcement greatly improves the aseismic performance of the tunnel working face.
Abstract：
Based on the Shimian Tunnel on the Ya'an-Lugu highway, this paper analyzes the effects of the earthquake dynamic response on the tunnel face and corresponding reinforcement measures. First, it describes the main types of earthquake hazards in tunnels and the mechanical equilibrium mechanism at the working face, and performs an earthquake dynamic response analysis using FLAC3D finite difference software aiming at analyzing the effects of earthquake on stability of working faces in different strata through comparing the working face stability condition under static and dynamic action. Then it summarizes the law of extrusion deformation and confinement pressure varying with the time-history of an earthquake. Using the average plastic shear strain, extrusion deformation and confinement pressure at the working face, it evaluates the reinforcement effects on the working face. Finally, it derives the following conclusions: the tunnel working face is more likely to be destroyed by an earthquake than the tunnel lining; there are different degrees of influence of the earthquake dynamic response on the tunnel working face in various strata, that is to say, the impact is less in a rocky stratum and greater in a soil stratum; and anchor reinforcement greatly improves the aseismic performance of the tunnel working face.
LI ,
Bin-1,
2
.Characteristics of the Earthquake Dynamic Response and Corresponding Reinforcement of the Tunnel Face[J] MODERN TUNNELLING TECHNOLOGY, 2014,V51(2): 56-62
2014, Vol. 51 