Analysis of energy release in impact instability damage of briquette model

A large number of energy can be released in coal bumpsIn order to quantitatively calculate energy released amount，the uniaxial compression singlepressure experiment of coal briquette model was carried out，and the ejection velocity of coal pillar in damage was measured by the highspeed photography to obtain energy release situation in failure of coal pillarIn addition，the amount of energy release is calculated by finite element method before and after destruction of the modelTaking into account a certain proportion of energy dissipation，the theoretical ejection velocity of coal pillar can be calculated by energy conservation principle，and the theoretical value is in good agreement with the measured valueFinally，this paper proves that the ejection velocity of coal fragments in failure measured from experiment is the same as the ejection velocity in failure from engineering practice