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1(. <br />Major divisions Group <br />symbol* <br />GW <br />GP <br />EM <br />Gc <br />SW <br />SP <br />VA <br />•C <br />IML <br />i5 <br />€ CL <br />D- <br />Ha I OL <br />CH <br />Ia <br />Pt <br />CLASSIFICATION OF SOILS FOR ENGINEERING PURPOSES <br />ASTM Designation: D 2487 — 69 AND D 2498 — 69 <br />(Unified Soil Classification System) <br />Typical nerves <br />Classification criteria <br />Wel I •graded grovels and <br />a <br />CUR <br />010 greater than 4; <br />gravel -sand mixtures, little <br />or no fines <br />r <br />CZ= (D3o = between 1 and 3 <br />S N <br />DIox06o <br />Poorly graded gravels and <br />gravel -sand mixtures, little <br />or no fines <br />Not meeting both criteria for GW <br />Silty grovels, gravel -sand- <br />v g <br />Attsrberg limits below <br />silt mixtures <br />y .= <br />"A' line or P.I. less <br />Atterbarg l lml t9 plot - <br />e <br />than 4 <br />ting it h m 4 area <br />are boo -do: 3ifi- <br />I <br />Clayey gravels, grovel• <br />Attarberg limits above <br />"A" line with P.I. <br />cet'or•s r►_ use <br />of due' symbk,,. <br />sand -clay mixtures <br />greater than 7 <br />,a <br />t! <br />Well -Waded sands and gra- <br />Cu - 2L° Wester then 6; <br />velly sands, little or no <br />fines <br />Q <br />C=* (Dsoj=o between 1 and 3 <br />z <br />Poorly graded sands end <br />gravelly sands, lime or no <br />z a <br />Not meeting both criteria for SW <br />fines <br />08 z° <br />U N <br />Silty Bands, sand -ell! miry- <br />tur« <br />8 <br />Attwberg limits below <br />line or P.I. Is" <br />Attsrbwg I I m I t a plot - <br />a E <br />then <br />t� <br />in hatched am <br />are borderline classifi- <br />es ! a <br />cations rs+.tuiring uss <br />Clayey sands, Nand -clay <br />m i xt uree <br />Inorganic silts, very fine <br />sands, rock flour. silty or <br />al <br />clayey fine sands <br />Inorganic clays of low to <br />6( <br />medium plasticity, gravelly <br />clays, sandy clays, silty <br />clays, lean clays <br />+r 4( <br />Organic silts and organic <br />silty clays of low plasticity <br />3( <br />Inorganic silts, micaceous <br />S <br />or diatomaceous fine sands <br />or silts. elastic silts <br />2( <br />Inorganic clays of high <br />plasticity, tat clays <br />Organic clays of medium to <br />high plasticity <br />Peat, muck and other highly <br />organic sods <br />10 <br />7 <br />4 <br />00 10 20 30 40 60 60 70 80 90 100 <br />Liquid Limit <br />Atterbarg limits above of dual symbols <br />"A" lira with P.I . <br />greater than 7 <br />Plasticity Chart <br />For elasalfieetion of fine-grained <br />soils and fine fraction of wares- <br />- grained soils. <br />CH <br />Atterbarg Limits plotting In <br />hatched area are borderline <br />classifications requiring use of <br />dual symbols. <br />Equation of A -line: <br />PI - 0.73 I LL - 20) <br />�.� <br />OH and <br />41H <br />CL <br />ML and OL <br />'Based on the material passing the 3 in. (7a we)'sic <br />■ <br />