Influence of different stress paths on shear mechanical parameters and failure response of rock
[Objective]The rock mass of the slope experiences complex stress paths and stress modes.Considering the actual stress environment of the rock mass,the corresponding mechanical tests are carried out to obtain the mechanical parameters of the rock mass,which has an important influence on the stability analysis and safety evaluation of the slope.[Methods]Taking red sandstone as an example,using conducted laboratory tests to study its mechanical parameter characteristics and failure response under different stress paths and shear modes.The stress paths include axial compression and axial shear,while the shear modes include conventional tangential loading shear and normal unloading shear.The failure modes,shear mechanical parameters and micromechanism of the rock were analyzed.[Results]The results show that:(1)there are obvious differences in rock failure modes under different stress paths,which are mainly manifested in the Angle between the through crack and the end face or shear plane,the deviation of the main crack and the fall off of the rock block.(2)Under different stress paths,the shear mechanical parameters of rocks also have obvious differences,which are mainly manifested in the changes of cohesion and internal friction Angle.(3)Numerical simulation result show that there are differences in rock mesoscopic mechanism under different stress paths,mainly due to the action of skeleton particles and filling cementing materials.[Conclusion]The research results reveal the influence of different stress paths on shear mechanical parameters and failure response of rock,which provides a useful reference for the evaluation of mechanical properties and stability of rock slope.
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