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Table 1. Rock classification based on unconfined compressive <br />strength. <br />No. Dvmpncat Uniazialeompressivestrengfn Exmplu <br />~~'s <br />~: . <br />S 1 VERY SOFT 504. - cuily molded <br /> with Ongers, shows distinct <br /> Locl marks. <br />S2 SOFf SO4, -molds with strung <br /> presstue from lingers, shows <br /> faint Led mules. <br />53 FIRM SOII, -very difficult to <br /> mold with Cutgers, iadeated <br /> with linger mil, diQiwll b <br /> eul with Land spade. <br />54 STIFF SOIL -canna be aalded <br /> with lingers, carutol be M <br /> ailh Lend spade, require Land <br /> picking for acwvstion. <br />55 VE1tY STIFF SOIL -very laugh, <br /> dilticull to move with hand <br /> pick pneumatic spade required <br /> for excavation. <br />RI V}3tY WFJsK ROCK - aumbla tmdrr <br /> ~nrp, blows with geological <br /> pick point. can be wt with <br /> pocket knife. <br />R2 MODERATELY WF,4K ROCK -Mellow <br /> wts ar uraping with pocket <br /> knife with di~ndty, pick <br /> point'vfdenb deeply will Grm <br /> blow. <br /> <br />R3 MODERATELYS7RONGROCK-knife <br /> tanrat be used to zrape or <br /> pee! surface. ahnllow indmta- <br /> tiom mrdct fmzt blow from pick <br /> point <br />A4 . ' STRONG ROCK • handheld sample <br /> breaks with one Cum blow Gem <br /> Lnmmer end of geological pick. <br />RS VERYST':ONGROCK-tequirts <br /> many blows liom geological pick <br /> fo bank intact aernple. <br />lbrmr kg/cmr MPa <br />d ~.4 x.04 <br />i10 0.40.8 0.04-0.08 <br />10.20 0.8.1.5 0.08-0-13 <br />20.80 1.56.0 0.15-0-60 <br />80.150 610 0.6-].0 <br />150.3500 10.250 ]-25 ChaUc rockmlt <br />7500-7500 250-500 25-50 Coal, schist, <br />aillslonc <br />7500- 500-]l>DO SO-100 Sandstone,slate, <br />15000 aMle <br />15000- 1000-2000 100-200 Marble, granite, <br />30000 grciss <br />> 30000 > 2000 > 200 Qtwtale. dolaite, <br />gabixo, basalt <br />i .. From: Hock .@ Bray, ]981; Deere 8. Miller, 1966; <br />Filgti, 1971 and R~bcruor4 197! <br />