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<br /> <br />I Table 1 - APPROi(Ii9ATE CLASSIFICATI ON OF COHESIVE SOIL ANO ROCK <br /> <br />' No. Deac-:ptsa>Z Uma~.:aL comorsaa{ve etrer~th I E-x+roZaa <br /> Z3/{n- k9/en- ~~a <br /> SI VERY SOFT SOIL - easily moulded <br /> with fingers, shows distinct <$ <0.4 <0.04 <br />' heel marks, <br /> S2 SOFT SOIL - moulds with strong <br /> pressure from fingers, shows $-10 0.4-0.8 0.04-0.08 <br /> faint heel marks, <br /> 53 FIRM SOIL - very diff icul[ [o <br /> mould with fingers, indented i0-20 0.8-1.$ O.DB-0. 1$ <br /> with finger nail, difficult to <br />' cut with hand spade. <br /> 54 STIFF SOIL - cannot be moulded <br />' ' with fingers, cannot be cut <br />with hand spade, requires hand 20_80 1.5-6.0 0.1$-0.60 <br /> picking for excava ci on . <br /> S$ VERY STIFF SOIL - very tough , <br /> gifficult [o move with hand 80-150 6-10 0.6-1.0 <br />' pick, pneumatic spade required <br /> for excavation. <br /> R1 VERY 'aEAK ROCK - crumples under <br />t snare blows wicn geplpgicaf <br />150-3$00 <br />10-2$0 <br />1-2$ <br />Chalk, rpcVcsalt <br /> pick point, can he cut with <br /> packet knife. <br /> R2 MODERATELY WEAK ROCK - shallow <br />' <br />I cuts or scraping with pocket <br />knife wi ch difficulty, pick <br />3$00-i $00 <br />2$0-$00 <br />2$'70 <br />Coal, Schi,c. silts Cane <br /> point indents deeply with firm <br /> <br />r <br />R3 blow. <br />MODERATELY STRONG ROCK - knife <br /> cannot be used to scrape or ]$00- <br /> Peel surface, shallow indenta- $00-1000 $0-100 Sandstone, slate, shale <br /> Lions under firm 61ow from pick 1$000 <br />' Point. <br /> R4 STRONG ROCK - hand-held sample 1$000- 1000-2000 100-200 Marble, granite, gneiss <br />' breaks wi ch one firm blow from <br />hammer end of geological pick. 30000 <br /> R5 VERY STRONG ROCX - requires <br />Qua rc2i[e, doleri te, <br /> many blows from geological pick > 30000 > 2000 > 200 gabbro, ba salt <br />~ co break intact sample, <br /> <br />1 <br /> <br /> <br />