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The Unified Rock Classification Systemd a Williamson and c r kuhn
The Rock Mass Rating RMR System Geomechanics Classification in Engineering
The Rock Structure Rating RSR
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applications B(tg B(utg Barton Bieniawski blasting borehole breakage calcrete classification elements Classification of Rock clay compressive strength degree of weathering determined developed discontinuities drilling Engineering Classification engineering geologist Engineering Geology Engineering Purposes estimated evaluation excavatability g-system geologists Geomechanics Classification geotechnical ground support hard rock ISRM joint roughness joint sets method mineral Mining parameters performance assessment planar separations planes of separation Proceedings properties quartzites range Rapid Excavation rib ratio rippability ripping RMR System rock burst Rock Classification System rock conditions Rock Engineering rock load rock mass classification Rock Mass Rating Rock Mechanics Rock Quality Designation Rock Structure Rating rock types rock unit S(mr sections shear zones shotcrete soil spacing stress support recommendations support requirements Symposium Table tests thick trench Tunnel Support Tunneling Conference U.S. Army unconfined compressive strength Underground Unified Rock Classification unit weight URCS