Abstract：The simulation of tunnel seismic wave field under complex conditions using the finite element method was presented in the paper.The characteristic analysis of the multidirections and multicomponents of the reflection records in tunnel indicate the importance of the separation of interested reflected seismic wave ahead of tunnel face from other directions and that of interested Pwave and Swave.Based on several numerical models，the analysis of flexibility of the FK conversion for the wave field separation show that FK conversion is effective in the separation of the multidirections and multicomponents of the reflection records from the wave ahead of tunnel face，even if the dips of reflector ahead of tunnel are varying widely(90°-45°).Because of the effects of high apparent velocity and interference waves，in the subsequent processing,Pwave has been separated as the main basis for Swave profile.For the angle of reflection layer<45°,due to its timedistance relationship is nonlinear，the difference between the designed filter of apparent velocity which based on the linear relationship of the direct wave and actual relationship is too large for pressure or shear waves,therefore errors of separation are large,so adopted migration processing before the FK conversion for the flat dipping fault.
Wang Zhaoling,Liu Zhengping,Huang Yunyan et al. MODELING RESEARCH OF F-K TRANSFORM APPLIED IN THE
TUNNEL EARTHQUAKE PREDICTION[J]. jgg, 2014, 34(4): 71-76.
