Numerical Simulation Of Tunnel Seismic Response Of The Groundwater Work

As we all known,the disadvantageous influence on high building by earthquake is serious,but actually so is underground structure.So it is necessary to analysis the seismic response to the underground structure.The underground structure includes water-conduit tunnel/underground powerhouse and transportting tunnel et.This paper is about the seismic response to a tunnel of hydroelectric station. And it includes some discuss after analysis by superposition response spectrum method and time-history method.The foundation of the actual engineering is regard to a half-infinite body.But because of limited calculation condition,the calculation scope is limited greatly while analyzing the seismic response to a tunnel of hydroelectric station.Therefore the reasonable scope and artificial boundary condition on cut of model become the important content which the paper discusses.The paper contains below contents:(1) Applying infinite software,buliding the 3-D infinite element model of a tunnel of hydroelectric station.(2) Analyzing the different vibrate mode's seismic response to the model by superposition response spectrum method,and the reasonable vibrate mode will be found.(3) Applying superposition response spectrum method to anslyse seismic response to the model,an discussing the reasonable caculation scope.(4) Using time-history method and inputting earthquake wave to analyzing reasonable artificial boundary condition on cut of model after setting the viscous-spring artificial boundaries on the cut.Then by setting different the mountain's modulus of elasticity,different damping ratio,and normal constraint disscussing the seismic response to the tunnel.