Abstract:  A high rock slope, which is beside a stonepit at the foot of Tianma hill in Shanghai, is taken as the research object. Surrounding the issue of dynamic stability of high rock slope in engineering and according to the results of laboratory and field tests, the interior factors influencing the stability of high rock slope were discussed, such as geological structure and site condition. Based on this, dynamic finite element method (FEM) analysis for the response of high rock slope under the earthquake will help to confirm the relationship between seismic load and the stability for slope. Combining dynamic FEM with shear strength reduction the dynamic integrity stability for the slope was studied. The results show that the horizontal thrust created by seismic load has significant impact on the stability for slope, which will make rock mass on the top be in danger of toppling into the pit. Meanwhile, the global safety factor and dynamic instability of the slope can be established by mutational displacement method.

Key words:  high rock slope, seismic stability, dynamic finite element method (FEM), strengthreduction, mutational displacement