Experimental study on uniaxial creep disturbance of rock in the neighborhood of strength limit

In order to study the response law of rock creep to the external disturbance in the field of strength limit neighborhood,the red sandstone is selected as the research object. Based on the RRTS- III rock rheological disturbance effect test system,the rock uniaxial compression creep disturbance test was carried out. The experiment explored the influence of the external disturbance on the creep law of rock at different creep stages inside the strength limit neighborhood and outside the strength limit neighborhood. The experimental results show that the response of the rock creep to the external disturbance is not obvious outside the strength limit neighborhood,and the deformation of the creep caused by the disturbance is small and recoverable. With the accumulation of the disturbance energy,the creep deformation amount decelerates increase to a stable state . The rock creep inside the strength limit neighborhood responds to the external disturbance obviously,and the creep disturbance deformation caused by the disturbance increases dramatically and cannot be recovered. As the disturbance energy accumulates,the creep deformation accelerates increase to the destruction of the specimen.