Stress-rate dependency of uniaxial compressive strength of hard rock with regard to test procedure standards

Abstract The uniaxial compressive strength test of hard rock is one the most worldwide applied tests for characterization in engineering and geology. as results this a basic parameter, used, example, design structures. In commonly standards, stress-controlled procedures using constant stress rates are recommended by wide range varying between 2 60 MPa/min and/or specific minimum time. Though effect stress-rate dependency generally known, investigation focused on dynamic action behavior high fast actions. Strain-controlled often used well. For within stress-rates, data base rather poor, effects to reported only very few researchers. research described paper aims close gap focuses rock. Seven different 1 100 five types (quartzite, granodiorite, gabbro, sandstone, basalt) fifteen single per rate have been executed. A significant increase increasing has stated; may not be ignored assessing projects. considered especially when parties involved site programs.