In order to understand the shear properties of salt rock under compression-shear state

the compression-shear test and acoustic emission test on salt rock at different insertion angle are designed. The characteristics of damage mechanics and acoustic emission signal for salt rock specimens at different shear angles are studied. In addition

considering the condition of compression and shear

the shear damage model with respect to shear stress and normal strain is established based on general dynamic model. Test results show that

with increase of placed angle

the mechanical characteristics of salt rock shift from plasticity for main features gradually to brittleness for main mechanical features; while the placed angle increases

the peak shear stress of salt rock decreases; the overall capacity of bearing load also shows declined trend; the capacity for deformation weakens with angle increasing and the capacity against deformation with angle increasing strengthens firstly and weakens lastly

reaching the maximum while angle of 45 degree. The acoustic emission test shows that

due to its own structure and damage features

the signal of salt rock under compression-shear state is comparatively apparent; while placed angle is 55 degree and 65 degree

the AE count of specimens in yield stage fluctuates more violently; and the process of break is also more fast; while placed angle is less than 45 degree

the AE count increases gradually; and the peak generally appears near the peak stress.