Investigation into the gas adsorption-loading coupling damage constitutive model of coal rock

Coal and gas outburst is the result of comprehensive action in situ stress, mechanical properties coal rock. The coupling effect loading adsorption eventually leads to rock failure. Based on principle strain equivalence considering stress loading, an adsorption-loading damage model established which breaks through bottleneck only a single influencing factor. Taking briquette samples with controllable as research object, uniaxial compression tests at different pressures are carried out verified based test results. results calculation show that meso-damage stage body can well correspond macroscopic deterioration phenomenon it good agreement stress–strain curve. It proved has applicability accurately describe failure process