Experimental study on permeability properties of damaged sandstone specimen in compression

Abstract This paper used MTS815.02 Electro-Hydraulic Servo-controlled Rock Mechanics Testing System to conduct a water seepage test in a sandstone specimen under triaxial compression condition. Mechanical parameters of the specimen and the transient values of the seepage pressure differences at the twelve testing points in completely stress-strain process of the sandstone specimen were measured. From the measured values, the damage values and permeability of the specimen at different stress stages of the sandstone specimen were calculated. Through the analysis of the experimental results, the law that the permeability varies with the damage value of the sandstone specimen was obtained. From the perspective of the damage development of the sandstone microstructure, the water flow mechanisms in different stress stages of the sandstone were discussed.