Estimation Methods of Dynamic Strength of Rocks
Yu. N. Linnik, V. Yu. Linnik
State University of Management, Moscow, Russia
Keywords: Impact load, rock, properties of rocks, drilling, testing method, drill bit, drilling rate, fracture resistance
Abstract
It is most effective to fracture very hard rocks by impact. On the other hand, application of the dynamic rock fracture method needs optimal parameters selected using modern techniques of estimation of rock fracture resistance dependent on the properties of rocks. The features of dynamic loading of an operating tool are discussed, and the classification of the dynamic rock testing methods is proposed. The rock crushability testing procedure is recommended. Resistance of rocks to fracture under dynamic loading is estimated, and the main estimation criterion is the volume yield of crushed material -7 mm in size. The strength characteristics of rocks from different testing methods were compared with the estimates of rock resistance to fracture by the selected criterion. The comparison shows a good agreement of the results, sufficient for engineering design.
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