关键词: 岩石隧道, 受震, 衬砌

Abstract: Many rock tunnels were damaged due to earthquake. The related subjects are important. This paper tries to figure out influential factors for rock tunnels subjected to seismic excitation. The results show that the greater the lining stiffness is, the greater maximum stress of lining is. That is, it is not suitable to enhance the stiffness as the main seismic design of tunnel lining. For the study about the interaction between tunnel lining and rock mass, the slip behavior between the rock and lining can reduce the stresses and achieve the reduction of seismic action. This study simulates reinforcement measures of rock tunnel such as shotcrete lining and auxiliary methods by the increase of equivalent stiffness of related rock mass. The increase of stiffness of lining will increase the maximum axial stress of the lining, but it will reduce the maximum shear stress and flexural stress. The increase of the area of the reinforced section will decrease the maximum axial stress of the lining, but it will increase the maximum shear stress and flexural stress. On the other hand, loosen area in surrounding rock due to poor excavation will reduce the stiffness. It will decrease the maximum axial stress of the lining, but it will increase the maximum shear stress and flexural stress.

Key words: rock tunnel, earthquake, lining