In order to investigate the law of failure and deformation of statically loaded rock under periodic load

by using the Instron electro-hydraulic and servo-controlled material testing machine

uniaxial test of red sandstone subjected to static-dynamic coupling loading is carried out. Furthermore

by way of combining uniaxial horizontal static loading device made by self and Instron electro-hydraulic and servo-controlled material testing machine

biaxial test of red sandstone subjected to static-dynamic coupling loading is performed. Experiment indicates that the failure mode of statically loaded red sandstone under periodic dynamic load changes according to different static stress states. The hysteresis loop of stress-strain curves of statically loaded red sandstone under period dynamic load is first sparse

and then dense

and then sparse

afterwards rock failure appears. Although the number of hysteresis loop and the value of complete strain of stress-strain curves of the same statically loaded red sandstone under different periodic dynamic loads are different

deformation of statically loaded red sandstone under period dynamic load obeys to the law of ultimate deformation of rock under period load; and there is tendency to the same equivalent complete strain energy of rock failure.