圆板状岩样破坏过程中的渗透特性试验研究

Using a self-developed special device together with the MTS815.02 Rock Mechanics Test System, we tested the permeability of round slices of rock specimen during its failure process, obtaining the relations between the axial load and the permeability, seepage pressure and the seepage velocity. The changes of the parameters are analyzed and discussed. The results show that the sample bends during permeability test, and the permeability of the sample is closely related with its forced state. The permeability of the sample increased dramatically when the load reaches the peak, which verifying that water-inrush is the seepage instability with the structure destruction. The pressure difference between upper and lower surface of sample decreases sharply when the load reaches the peak. Keeping the pressure difference around 0.2MPa during the test, we find that the turbocharger piston displacement increases rapidly when the load reaches the peak, that is, the seepage velocity increases suddenly. The failure by punching shear is the main failure mode.