Abstract: A high steep rock hill with two-side slopes near National Road 213 is used as a prototype. Combining with the results of shaking table test, the landslide mechanisms of the high steep rock hill with two-side slopes are researched by a new continuum-discrete element method (CDEM). The research results show: The stress concentration phenomenon appears at the top of the sliding mass firstly; and then some tension failure points and some shear failure points appear there, which expands toward the toe of the sliding mass from the top of that along the structural plane. At the same time, the number of tension failure points gradually increases. At last, the toe of the sliding mass breaks; and then the sliding mass shears out from the toe. The non-consistent movement, the reduce of strength of the structural plane and the difference of distribution and dissipation of the earthquake energy in the sliding body and the sliding bed are three of the major influence factors which induce the landslide. When the accelerations are small, the instantaneous frequency of the accelerations between sliding bed and sliding body are generally consistent; the energy transmittance coefficients of the sliding structural plane and the regulatory frequency band all range in a limitation. With the increase of the seismic intensity, the instantaneous frequency and the energy transmittance coefficients gradually decrease; and then they are steady within the lower limitation. At the same time, the regulatory frequency band also gradually shifts from high frequency band to the lower one.

Key words: Continuum-discrete element method (CDEM), Hilbert-Huang transform, earthquake, landslide responses