Laserfiche WebLink
UNIFIED BOIL CLASSIFICATION SYSTEM <br />mkiocdivWoM <br />u <br />II <br />II <br />i <br />£ <br />? <br />o <br />1 <br />c <br />.2s * <br />I <br />itI <br />1-5 <br />ii1“ <br />ai| <br />II <br />Group <br />fymbolt <br />GW <br />ifih <br />1 <br />is <br />P5l <br />ll.t|lir <br />Typicoi namos LaPoratory dasHication eritaria <br />Wail-pradad gravals. gravel-sand <br />mixtures, little or no finas <br />Poorly graded gravels, gravel- <br />sand mixtures, little or no fines <br />Silty gravels, gravel-sand-silt <br />mixtures <br />Clayey gravels, gravel-sand-clay <br />mixtures <br />Well-graded sands, gravelly <br />sands, little or no fines <br />SM <br />Poorly graded sands, gravelly <br />sands, little or no fines <br />Silty sands, sand-silt mixtures <br />aayey sands, sand-day mix­ <br />tures <br />ifUL <br />SI!l|S <br />Hill? <br />Cu*^—greater than 4; Cc'*o,qXO60 **®*'"'**" ' ^ <br />Not meeting all gradation requirements for GW <br />Atterberg limits below "A" <br />line or P.l. less than 4 Above “A" line with P.l. <br />between 4 and 7 are bor- <br />derlin* cases requiring use <br />of dual symbolsAtterberg limits above "A" <br />line with P.l. greater than 7 <br />Dm <br />‘“'o.o ''■o.oXOm <br />Not meeting all gradation requiremerii'- lor SW <br />Atterberg limits below "A" <br />line or P.l. less than 4 Limits plotting in hatched <br />zone with P.l. between 4 <br />and 7 are bordtrline cases <br />requirirtg use of dual synv <br />bols.Atterberg limiu above "A" <br />line with P.l. greater than 7 <br />5 fe <br />ll <br />fl <br />“■? <br />o <br />C2 <br />S <br />ll <br />11 1 <br />S <br />I <br />H«I <br />I? <br />I <br />ill <br />Inorganic silts and very fine <br />sands, rock flour, silty or clay­ <br />ey fine sands or clayey tilts <br />with slight plasticity <br />60 <br />Inorganic clays of low to me­ <br />dium plasticity, gravelly clays, <br />sandy clays, silty clays, lean <br />clays <br />Organic silts and organic silty <br />clays of low plasticity <br />MH <br />Inorganic silts, micaceous or <br />diatomaceous fine sandy or <br />silty soils, elastic silts <br />Inorganic clays of high plas­ <br />ticity, fat clays <br />-I----+----1 <br />— For clasification of fme-grained <br />__soils and fine fraction of coarse- <br />__grained soils. <br />— Atterbarg Limits plotting In- <br />— hatched area are borderline dassi- <br />“flcations requiring use of dual <br />__symbols. <br />Equation of A-line: - <br />-------PI=0.73(LL-20) <br />Organic clays of medium to <br />high plasticity, organic silts <br />CL-MI <br />i'i' <br />MLaidOL <br />X <br />.OH and MH <br />Peat and other highly organic <br />•oils <br />b 10 20 30 40 50 60 70 80 <br />Liquid Limit <br />Plasticity Chart <br />100