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CLASSIFICATION OF SOILS FOR ENGINEERING PURPOSES ASTM Desi~ation: D 2487 - 66 T AND D 2488 - Eli T ~nified Soil Cl~uification Sy~tem Gro4Jp Typical nantes Leboretorv cl~sifioation cHtefla Major divWom ~ Well-graded gravels, .~vel~and D60 (D30)2 *..~ GW mixtures, litlle or no fines ~ .eater then § ~ '.- Cu=D~ o CC'D, oXO,o betw~n 1 ~cl 3 ~' Not meeting all gradation requirements for GW '~ d Silty gravels, gravel-sand,il, .~ ~ :~ ~ Atterberg ,imitsbelow "A" , GM mixtures . o o ~ Above line with P.I. o o ~ ~ darlene cam requiring ~ *~ Well-gradedsends, gravelly ',-c ~ ~ ~ D~0 (D~o)~ ~ c , ~_ SW sands, 'lille or rm fines ~ '~ : : : Cu--D'~0 ,eater than 6; Cc-o,0xD60 between I and3 i 0 ~ SP Poorly .acled sands, gravelly ~c = " : : : Not meeting all gradation requirements for SW P~_.~ SM Silty uncle, sand-silt mixtures o ~ ~ ~ ~ line or P.I. less than 4 Limits plotling in hatched -- ! ~ u ~.0'~ _c ~ zone wlth P.I. betwean, " ~, = ~' u ~ ,- and 7 are bordeHine e~es -- Clayey sands, sand-clay mix- ~; ~--~ .~ 2 Atterberg limits above "A" bols. '~ 'i ~ SC lures line with P.I. greater than 7 Inorganic silts and very fine sands, rock flour, silty or clay- ~ ML ey fine sands or clayey silts 60 c with slight plasticity I For classification of hne~ramed ~ ~ Inorganic clave of Iow to me- I soils end fine fraction of coarse- .~ _ dium plasticity, ,avelly clays. ~ grained soils. ~ .~ sandy clays, silty clays, lean Atterberg Limits plotting in _ = clays hatched area ere borderline cleasi- CH m ~ ~ fications requiring use of dual / = Organic silts end organic silty 40 Equation of A-line: ~ ~ OL clays of low pleslicity i P1-0.73 {LL - 20) il Inorganic silts, miceceous or MH diatomaceous fine sandy or '~ "~ OH ar J MH 1; Inorganic clays of high plea- CL ~5 ~ ~ CH ticity, f.t clays / " 4 ...... MLe dOL ¢ '~' Organic clay~ of medium to , L./ -~ OH high pl~ticity0 organic silts 0 ~ 0 10 20 30 40 50 60 70 ~0 Liq-id Limit > ,u. Peat a~d other highly organic Iq~ticity 'subterranean en.ineerin- corn. For classification of hneGramed / soils end fine fraction of coarse- ~ grained soils. Atterberg Limits plotting in hatched area are borderline cleasi- CH fications requiring use of duel __ symbols. Equation of A-line: / P1=0.73 {LL - 20) ,,¢~ OHar JMN / CL /