To study the relationship between the power and energy of rock crushing in underground engineering disasters

such as rock outbursts

experiments were done on the crushing and the Protodyakonov coefficient of different rocks

the selective grinding processes classified according to particle size

and the uniaxial compressive strength. This work was based on rock crushing theory. The relationship among Protodyakonov coefficient

specific crushing energy and uniaxial compressive strength of different rocks was studied using regression analysis. The results show that the Protodyakonov coefficient of a rock is linearly dependent on rockspecific crushing energy and uniaxial compressive strength. Such a relationship corresponds to the cracking theory and can be used for further research.