隧道洞口段三维地震反应分析

Three dimensional analysis of seismic responses of the portal of a tunnel

采用有限单元法，对一隧道洞口段进行了三维弹塑性地震反应分析．分析中用节理单元模拟了隧道衬砌抗震缝，并采用了三种边界条件、两种激振方向，评价了该隧道在九度地震作用下的安全与稳定性．

In this paper, three dimensional finite element elastoplastic analysis of the seismic responses of the portal section of a tunnel is presented. In the analysis, joint elements are applied to simulate the antiseismic joints of tunnel structure, and three types of boundary conditions, exitation in two directions are accounted for. The safety and stability of the tunnel in the region of high earthquake intensity are evaluated.