Time-dependent deformation characteristics of red sandstone under multiple dynamic disturbances

In order to explore the time-dependent deformation characteristics of deep engineering rock mass under disturbed action, the dynamic disturbance triaxial loading tests on red sandstone are carried out by using the disturbed servo triaxial loading system. The time-dependent deformation characteristics and failure modes of red sandstone damaged by disturbance under different confining pressures and axial pressures are analyzed. The test results show that under the action of dynamic disturbance, the axial strain-time curve of rock rises in an oscillating manner. The disturbance loads will cause the phenomenon of sudden increase of strain in rock, and the sudden increase of strain decreases exponentially with the number of disturbance. The application times of cumulative disturbance before rock failure increases with the increase of confining pressure, and decreases with the increase of axial stress loading level. The dynamic disturbance loads will lead to rapid failure of rock at higher static stress level, but it will lead to aging failure similar to the fatigue failure at lower static stress level.