The response properties of displacement and stress of tunnel support structure are discussed in detail under the action of horizontal earthquake acceleration(Ya)

longitudinal earthquake acceleration(Za) and horizontal-longitudinal earthquake acceleration(YZa).This discussion is based on an analysis of the surrounding rock-support structure-earthquake interaction

adoption of an ADINA nonlinear finite element and construction mechanics

and transient dynamic time domain analysis of a large cross section tunnel.Results of analysis show that:(1) Horizontal earthquake acceleration has important influence on horizontal displacement

maximum principal stress

acceleration and velocity.(2) Longitudinal earthquake acceleration has important influence on longitudinal displacement

effective stress

maximum and minimum principal stress

maximum shear stress

acceleration and velocity.(3) When Ya=0.191g and 0.440g or Za=0.141g and their combined action

the initial support of tunnel would be damaged and the local lining would have partial damage.(4) When Ya=0.440g or Za=0.326g and their combined action

the lining of tunnel would be damaged.(5) When Ya=0.880g or l Za=0.652g

the support structure of tunnel would have severe damage.