Experimental study on the law of gas flow in coal body under action of true three dimension stress

摘要

With the seepage equipment of the test system of gas and liquid relative permeability in coal body the law of gas flow in coal body under action of true three dimension stresses is studied. The research results show that when pore pressure is not change with the change of volume stress the permeability of coal body change with the negative index law and when volume stress is not change with the change of pore pressure the permeability of coal body change with the parabolic law. The research result have some refer ence significance for gas drainage in coal mine and coal-bed methane development.