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	Lomová houževnatost hornin a vliv rychlosti zatěžování v módu I Vavro, Leona The presented paper presents another results of the rocks fracture toughness measurement. The influence of the loading velocity on the fracture parameters was investigated. The loading velocity was continually changed in values 1; 0,1 a 0,01 mm/s. The measurements were realized on selected rocks in the laboratory conditions in the Institute of Geonics AS CR. Detailed record
	Test equipment for measurement of the rock fracture toughness Vavro, Leona Presented contribution provides basic knowledge of development in the methodology of rock fracture toughness measurement in the laboratories of the Institute of Geonics AS CR in Ostrava. Fracture toughness is a relatively new parameter in geomechanics; the laboratory preparation of rock specimen is very time consuming. The fracture toughness of rocks may be practically used in a wide range of application; e.g. prediction of the anomalies in the geomechanics processes like the rock bumps. Detailed record
	Měření lomové houževnatosti hornin s použitím deformačních charakteristik Vavro, Leona The paper describes another phase of establishing the methodology of the rocks fracture toughness in the laboratory conditions in the Institute of Geonics. The involvement of an extensometer in the measurement allows us to obtain not only the power but also the deformation characteristics of the damage process. Detailed record

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