Experimental Research on Permeability of Round Slice Rock Specimen in Its Failure Process
圆板状岩样破坏过程中的渗透特性实验研究

Using a self-developed device together with a MTS815.02 Rock Mechanics Servo Test System, permeability experiment of round slice rock specimen in its failure process was carried out, relations among the axial load and the permeability, the seepage pressure and the seepage velocity were obtained. Experimentally obtained parameters were analyzed and discussed. Results show that 1) rock specimen bends during the permeability experiment, and the permeability is closely related with its force-acted state. Permeability increases sharply when load reaches peak value, which validates that water-inrush is seepage instability due to the structure destruction. 2) Pressure difference between the upper and lower surface of specimen decreases sharply when load reaches peak value. 3) Keeping the pressure difference between the upper and lower surface of specimen around \{0.2MPa\} during the experiment, it is found that the turbocharger piston displacement increases rapidly when the load reaches peak value, that is, the seepage velocity increases suddenly. 4) The punching shear is the main failure mode.