Experimental Study On Gas Permeability Variation Of Tectonic Coal In The Process Of Bearing Stress

Using the particular firmness coefficient of tectonic coal raw coal sample to carry out experimental study on gas permeability variation of tectonic coal in the process of bearing stress by triaxle servo-controlled seepage equipment. The variation of tectonic coal gas permeability is revealed in the conditions of different bearing pressure. Based on permeability variation range, the tectonic coal is carried out quantitative classification. Through exploring the relationship between firmness coefficient, effective porosity and gas permeability, the mathematical model of gas permeability and effective porosity is established. The process of getting the maximum gas permeability is simulated by using COMSOL Multiphasic software in the process of bearing stress.