Studies on triaxial rheological deformation and failure mechanism of hard rock in saturated state

Triaxial compression rheology experiments of hard marble and greenschist specimens in saturated state were carried out on the rock servo-controlling rheology testing machine.Based on the triaxial rheological experimental results of hard rock,the variance of axial and lateral strains of hard rock with the time under different confining pressures was investigated,and it provided important reference for the identification of parameters in the rheological numerical finite element analysis of rock engineering.Then the relation between axial deformation and lateral deformation of rock was investigated.The effect of confining pressure and grain size on the axial and lateral deformation properties was analyzed.At the same time,the plastic deformation property of rock in the process of triaxial rheology was also analyzed.The effect of rheological stress level on the lateral-axial deformation property of hard rock was discussed detailly.In the end,microscopic characteristics of rheological failure shaping fracture of rock under different confining pressures were analyzed.