A Preliminary Experimental Study on the Effect of Confining Pressure or Gas Pressure on the Permeability of Coal Samples

To provide technical support for gas extraction and accident prevention technology, the permeability law of in coal seams under different ground stress pressure has been explored. The evolution sample confining was deeply studied by using rock mechanics–permeability test system TAWD-2000. conclusions are as follows. samples can be divided into three stages whole stress–strain process, gradually decreasing stage, tending to stable slowly rising significantly stage. When axial constant, decreases with increase pressure. first then rises gradual Under pressures pressures, change degree rate process. research results necessary data subsequent numerical calculations practical engineering application.