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`` <br />• MainCressonSlopeEvaluation AdrianBrown <br />Table 8. CS1R Classification of Jointed Rock <br />A_ CLASSIFICATION PARAMETERS AND THEIR RATINGS <br />• <br />PARAMETER RANGES OF VALUES <br /> <br />qth <br />Str Point food <br />> B MPo <br />4-8 MPo <br />2-4 MR) <br />I -2 MPo For this low range <br />-un"lolcial compres- <br /> ~ strength ildex sive test is eferred <br />I iMOCt rock <br />moteriot Untoxid <br />compressive <br />> 200 MPO <br />100 -200 MPO <br />50 -100 MPo <br />25 - 50 MRl 10.25 <br />MPo 3-10 I-3 <br />MPa MPo <br /> she th <br /> Rating IS 12 7 4 2 I 0 <br /> Drill core quality R 0 D 90 % -100% 75% -90 % 5l7%-75% 25 % - 50 % < 25 <br />2 <br />Rating <br />20 <br />17 <br />13 <br />8 <br />3 <br /> SDacingof jams >3m 1-3m 0.3-Im 50-300 mm <SOmm <br />3 <br />Rating <br />30 <br />25 <br />20 <br />10 <br />5 <br /> <br />Very rough surfaces <br /> <br />SIigHIy rough wrforPS <br /> <br />Slightly rough surfoors Slickerlsided surfaces <br />or <br />i <br />1 W119e>Smm thick <br /> <br />Conditan d joints Not continuous <br /> <br />No separd'an <br />Separation CI mm <br />Separation <1 mm ~~ Cg mm th <br />ck a <br /> <br />Joints open )Smm <br />4 Hard jolly wall rock Hard tM wall rock <br />W Soft - ud wall rode <br />A JoNts open I-Smm <br />Continuous 'ants ~^tinuous joints <br /> Rating 25 20 t2 6 0 <br /> Inflow DerlOm None <25 litres/min. 25-1251itres/min 1 ) 125 litres/min <br /> <br />' Ground tunnel length <br />1O:::w°:° <br />RMio <br /> <br />0 OR---- f <br /> <br />0.0-02 OR <br /> <br />0.2-0.5 OR <br /> <br />>0.5 <br />5 water 111pi0,pi„sp01 R OR OR OR <br /> ' O Moist only 'Water undermoderde Severe <br /> 'GenerolaxdA <br />rors Completetydry (interstitial water) pressure walr~ prodems <br /> Rating 10 7 4 0 <br />o GATT\If! An t11CT~ACNT CAD In1AlT nDICAITATInNC <br />Strike and dip <br />orientations d 'pints Very favourobk Favourable Foir Unfavourable Very un}avouroble <br /> Tunnels 0 -2 -5 -IO -12 <br />Ratings Foundations 0 -2 -7 -15 - 25 <br /> Slopes 0 -5 -25 -50 -60 <br />r enrv once rl AceCC nCTCDxA1MCt1 FRnAA Tr1TAl RATWGS <br />Rotinq IDO-81 80-61 60-41 40-21 C 20 <br />Class No. 1 II III IV V <br />Description Very good rock Good rock Fair rock Poor rock Very poor rock <br />n ucAwnlr_ rte Dnrlr once rt ACCFC <br />Class No. I 11 III IV V <br />Average stand-up time IO years fa Sm span 6 rrantlu tar 4 m sport 1 week for 3 m spm Shours for ISm span IOmin. for 0.5m span <br />Cohesion of the rock moss > 300 kPo 200-300 kPa 150 -200 kPa 100 - 150 kPa C 100 kPo <br />Friction angle d the rock mass >45° 40°-45° 35°-40° 30°-35° <30° <br />• <br />1385D.980872 38 <br />