Considering the characteristics of the rocks surrounding Grotto Relics reinforced by prestressed anchor cables

the influence factors and dynamic finite element analysis methods are described.Focusing on three sections of Yulin Grottoes in Axin of Gansu Province

the dynamic response of rock mass is revealed through numerical simulation of displacement and stress field under dynamic loads with different PGA

spectra and durations.The results indicate weak points for seismic retrofitting.It also shows that the displacement and stress increase

range of stress concentration expands and the damages probability of country rock increases with the increasing of peak ground acceleration（PGA）

characteristic period and duration of dynamic loads.The distribution of stresses is closely related to the quantity

combined feature

geometry shape and size of caves.This paper provides theoretical basis and practical reference for the preservation of grotto relics and seismic retrofit and seismic hazard mitigation for the rock mass.