Abstract：Rocks are natural complex medium with micro cracks, micro-holes and other defects. It is significant to study their performance under complex stress state, especially under combined compression-shear loading for their engineering applications. Quasi-static and dynamic experiments of granites under combined compression- shear loading were carried out by adding a set of double beveled device in MTS for quasi-static experiments and in Split Hopkinson Pressure Bar (SHPB) experimental devices for dynamic experiments. When changing the inclined angle of cushions, equivalent load-displacement curves of granite samples under different loading paths were obtained. By decoupling these curves, compression and shear properties of granite samples were discussed, respectively. Failure surfaces were further analyzed. The results showed that failure strength of granite had obvious loading rate effects and compression-shear coupling effects. The technique was helpful for the study of the mechanical properties for rock under complex stress states.
2014, Vol. 35 
