ANALYSIS OF METHODS FOR ASSESSING ROCK FRACTURE RESISTANCE UNDER DYNAMIC LOAD APPLICATION

It is known that the choice of effective ways and means of rock destruction is one of the most important tasks facing the coal and mining industry.For rocks of high strength, as practice has shown, the most effective is the impact method of their destruction.However, the effective application of the dynamic method of rock destruction is possible only at certain optimal parameters, the choice of which should be based on modern methods of assessing the resistance of rocks to destruction, depending on the properties of rocks.In this connection in the article the features of dynamic character of loading of the working tool are considered and classification of methods of dynamic tests of rocks is offered, on the basis of which the methodology of tests on rock crushability is recommended.The estimation of rock resistance to destruction by dynamic loads is proposed, the main criterion of which is the volume yield of crushed material of minus 7 mm fraction.The data on rock strength characteristics obtained using different test methods were compared with the assessment of rock resistance to impact fracture by the selected criterion.The comparison results showed good convergence, sufficient for engineering calculations.