Experimental Study on Influence of Confining Pressure on Floor Rock Permeability in Stope

摘要

Floor rock permeability in stope is the fundamental subject of engineering technology field for preventing mine water inrush.The relationships of complete stress and strain with permeability and main stress difference were obtained through permeation testing of complete stress and strain process on floor limestone and mudstone under high and low confining pressure.The results show that the joint opening of rock preexisting fractures,and initiation and extension of rock newborn fractures were restricted to confining pressure;permeable fractures would be gradually closed and consolidated due to high confining pressure,lowering the rock permeability,besides,the confining pressure had less effect on limestone permeability than that of mudstone.