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u <br />u <br />11 <br />UNIFIED SYSTEM <br />CLASSIFICATION OF SOILS FOR ENGINEERING PURPOSES <br />ASTM DESIGNATION D-2487 <br />Maj-pr Divisions <br />N U <br />�o <br />zCC <br />W O d 0 <br />ti <br />LV <br />'0 <br />SAN <br />Group <br />Symbols <br />Typical <br />Names <br />Well -graded gravels and <br />ow gravel -sand mixtures, <br />little or no fines <br />Poorly graded gravels and <br />op ravel -sand mixtures, <br />little or no fines <br />Sil gravels gravel - <br />GM sansitt mlxiures <br />Clayey gravel! •avel- <br />OC sand -clay mlxLures <br />Well -graded sands and <br />sr gravelly sands, little <br />or no fines <br />-?oriy graded sands and <br />gravelly sands, little <br />or no fines <br />Silty sands, sand -silt <br />sM mixtures <br />so Clayey sands, sand -clay <br />mi xtures <br />Inorganic silts, rock <br />flour, silty or clayey <br />AIL fine sand <br />Classification Criteria <br />Cu - De0 / DIG <br />Greater than 4 <br />Cs D102 <br />DSO <br />Between 1 and 3 <br />a+ N <br />Not neeLing both criteria for ow <br />o <br />N � <br />y v <br />" <br />Atte►bery'limrfts plot <br />below "A" line -it, <br />Atterberg limits plot- <br />, . I <br />plasticity index <br />ting in hatched area <br />a <br />less than 4 <br />_ffierberg <br />are borderline <br />b,�• t <br />limits plot <br />"A" <br />classifications re - <br />above line and <br />quiring use of dual <br />plasticity index <br />symbols <br />c <br />l i 4 C <br />lei <br />greater than 1 <br />�► _ <br />Cu - D60I D10 <br />Greater than 6 <br />m N <br />CX - (D an12 <br />Between 1 and 3 <br />Q <br />8 <br />N <br />D10 %De0 <br />1 N <br />5 <br />Not meeting both criteria <br />for sY <br />i $ <br />on �>g <br />Atterberg limits plot <br />Below "An line or <br />Atterberg liwAts plot- <br />d <br />plasticity index less <br />than 4 <br />ting in hatched area <br />borderline <br />�- <br />are clas- <br />Atterbery li ts plot <br />"A line <br />sifications requiring <br />above and <br />use of symbols <br />plasticit index <br />greater t�ian 1 <br />Inorganic clays 0 Ow 0 <br />sodium plasticity. yrav- <br />lz elly clays, sandy clays. <br />60 <br />tioiiw <br />For ettassifi ct, of fine- <br />_ silty clays. lean clays <br />50 <br />grained eoite and ii• Mottos <br />Organi c silts and organic <br />Of oome-ruined •otts• <br />Atterberg tiwite <br />OL silty clays of low <br />40 <br />ptotting in <br />hatehed arm my borderline — <br />plasticity <br />o' ,ifioastort. regatrinp <br />Inorganic silts, micaceous <br />iP <br />30 <br />we. of drat eMtbota. <br />a�watton of A-t <br />Aff or diatomaceous silts, <br />1 <br />pi- o.?a rrc-:o <br />elastic silts <br />20 <br />_ <br />— <br />Inorganic clays of high <br />C9 plasticity. fat clays <br />1 <br />Organic clays of ndi umi <br />CH to high plasticity <br />M <br />0 0 10 20 30 40 50 60 10 <br />Uquid Unit <br />organic soils pt hat. muck and othor <br />gh y orgainic so.i& Visual -manual identification <br />BRAUR" <br />ENGINEERING TESTING <br />