Abstract: For the significant impact of blasting on slope stability during open-pit mining process,the dynamic finite element method is used to analyze the variation of slope stability with the time in blasting.Firstly,the finite element model of mine slope is established,then the finite element strength reduction method is adopted to get the most dangerous sliding surface and safety coefficient of the slope.After that,based on the most dangerous sliding surface obtained,a three-dimensional entity model of slope and explosives was created,the blasting parameters are arranged and the initiation time for each hole is set up.Next,this model is calculated after the initiation.The dynamic response process after slope explosive for 30 s is solved by LS-DYNA large dynamic finite element program.Combining with the limit equilibrium method and dynamic finite element method,the safety factors of slope at every moment under unified detonation are calculated.Slope stability should be comprehensively evaluated by the time-history safety coefficient and whether the elements of the sliding surface are destroyed at the same time.The simulation results can dynamically display the security status of slope blasting process,and the result is very close to that by the limit equilibrium method.This research could make a reference for the blasting design.

Key words: Dynamic stability, Safety coefficient, Time history analysis, LS-DYNA, Numerical simulation