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CLASSIFICATION OF SOILS FOR ENGINEERING PURPOSES <br />ASTM Dttignation: O 2487 - 66T AND D 2488 - 66T <br />Jntlitd Soil Ctottification Svfttm <br />Mijor divMont Group <br />f^mboli Typical namai Laboratory cla«iftcafion crittria <br />s <br />'3 <br />I s <br />J! 6 <br />II <br />1 <br />i s <br />•5 <br />I <br />I <br />I <br />! <br />I <br />=1 <br />■h <br />*P <br />!< <br />'vII <br />I <br />W#ll*graded gravali, graval^sand <br />mlxturat, littia or no fines <br />Poorly pradad gravels, gravel- <br />undmixturesJinte or no fines <br />Silty gravels, gravel-sand-silt <br />mixtures <br />Dayey gravels, grevel-sand-clay <br />mixtures <br />! <br />l <br />,1 <br />s^ I <br />□ <br />Well-graded sands, gravelly <br />sands, little or no fines <br />Poorly graded sands, gravelly <br />sands, little or no fines <br />I <br />‘3 <br />t <br />*3 <br />I! <br />IIli <br />3 <br />■o <br />I <br />I <br />10 M t <br />eL-o| - <br />5511 <br />o. y <br />Silty unds, sand-tilt mixtures <br />Clayey <br />turas <br />ends, und-clay mix- <br />rrfijI SI si <br />llllll <br />il>iSsllr^” <br />Dho <br />—greater than 4; ^c* betvwen 1 and 3 <br />Not meeting all gradation requirements for GW <br />Atterberg limits below **A*' <br />line or P.l. less than 4 <br />Abov, “A" liiw with P.l. <br />batwMn 4 and 7 ara bor- <br />dbr/ine cases requiring uu <br />of dual symbolsAtterberg limits above **A** <br />line with P.l. greater than 7 <br />Oio (Dm)^ <br />greater than 6; batwun 1 and 3 <br />Not muting all gradation raqulramonts for SW <br />Atterberg limits below **A” <br />line or P.l. lets than 4 Limits plotting In hatched <br />zone with P.l. bttwun 4 <br />and 7 ara bordteU’m euu <br />requiring uu of dual sytn- <br />bols.Atterberg limits above **A*' <br />line with P.l. gruter than 7 <br />O <br />II <br />s <br />ll <br />y»2 <br />Inorganic silts and very fine <br />sands, rock flour, silty or clay- <br />ay fine unds or clayey silts <br />with slight plasticity <br />60 <br />Inorganic clays of low to me­ <br />dium plasticity, gravelly days, <br />undy clays, silty clays, lean <br />days <br />Organic silts and organic silty <br />clays of low plasticity <br />It <br />MM <br />Inorganic silts, micaceous or <br />diatomacaoue fine sandy or <br />silty soils, elastic tilts <br />Inorgsnic days of high plas­ <br />ticity, fat clays <br />Organic clays of medium to <br />high plasticity, organic silts <br />10 <br />7 <br />4 <br />0 <br />1 1 1 1 1 <br />For claaification of fina-grai <br />soils and fine fraction of coa <br />__grained soila. <br />Atterberg Llmlte plotting <br />hatched aru ara bordarlina dr <br />fications requiring uu of c <br />symbols. <br />1 <br />nad <br />»ru-y / <br />1 In <br />■il- <br />fuel CH <br />/ <br />/ <br />Eq uatlon <br />PI-0.; <br />of A-lii <br />3(LL <br />na: <br />•20) <br />/ <br />a* <br />/f OH an dMH <br />CL <br />/ <br />/ <br />......:L-Mi5 MLai dOL <br />Put and othsr highly organic <br />soils <br />30 40 50 60 70 <br />Liquid Limit <br />PIsMicHy Chart <br />180 <br />subterranean engineering ino.