Abstract: This study investigates the failure behavior of soft-hard interbedded rock mass under dynamic loading conditions in the Shuimogou landslide area of Wenchuan, using soft-hard interbedded rock specimens created according to the similarity theory. Cyclic loading tests involving uniaxial compression and variable upper and lower limits were carried out to explore the dynamic characteristics and failure process of the specimens. The results show that the failure modes include tensile failure (0°-30°), shear failure (45°-75°), and cleavage failure (90°), depending on the dip angle of the rock layer. For specimens with the same inclination angle, strength increases with loading frequency and confining pressure, while strain decreases with the former but increases with the latter. In addition, higher loading frequency leads to the transfixion of vertical tension cracks and the decrease of fracture degree.

Key words: dynamic characteristic, cyclic loading test, soft-hard interbedded rock mass, Shuimogou landslide, uniaxial compression