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Sm <br /> MINEW <br /> t>a <br /> UNIFIED SOIL CLASSIFICATION SYSTEM <br /> PRIMARY DIVISIONS SECONDARY DIVISIONS <br /> GRAVELS CLEAN GW Well graded gravels,grave!-sand mixtures,little or no fines. <br /> GRAVELS <br /> �_ '_' _� fklore than half o! (Less Than 5 fines) GP Poorly graded gravels,gravel-said mixtures,little or no tines. <br /> kl:A O O w coarse fraction is <br /> Nocn > GM Silly grave.a sieve GRAVELls,gravel-sand-silt mixures,non-plastic fines. <br /> n -N larger than <br /> cap z >= 0 WITH FINES GC Clayey gavels,gravel-sand-clay mixtures,plastic fines. <br /> o r <br /> cz r zCLEAN SW %Jell graded sands,gravelly sands,little or no fines <br /> - SANDS <br /> c m SANDS <br /> y Mcre than half of (Less than 5%fines) SP Poorly graded sands or gravelly sands,little or no fines. <br /> W coarse fraction is <br /> O smaller than SAND SM Silly sands,sand-silt rmxtures,ncn•plastic fines. <br /> NO,4 sieve WITH FINES <br /> Sc Clayey sands,sand-clay mixtures,plastic Sines. <br /> mI Inorganic sills and very fine sands,rock Ilow,silty or clayey fine sands or <br /> to <br /> SILTS AND CLAYS ML cayey clayeysilts W-1h slicht las:'-+t . <br /> a = y Liquid limit is CL Inorganic clays of law to mod am plasticity,gravelly clays,sandy clays, <br /> in toss Than 50 6 in clays,lawn clays. <br /> E <br /> F-, � o r OL Organic sills and organic silly clays o4 low plasticty. <br /> d <br /> a r z SILTS AND CLAYS MH lnotganic sills,m caceeus or diatomaceous fine sand or silty sails,elastic silts. <br /> rs C <br /> _ Liquid limit is CH Inorganic clays of high plasticity,fat clays. <br /> LU <br /> Z 01 greater than 501% <br /> LL OH Organic clays of medium to high plasticity,organic silts. <br /> �HIGHLY ORGANIC SOILS Pt Peal and other highly orgFaic soils. <br /> DEFINITION OF TERMS <br /> " U.S.STANDARD SERIES SIEVE CLEAR SQUARE SIEVE OPENINGS <br /> 200 40 10 4 314" 3" 12" <br /> SAND GRAVEL <br /> SILTS AND CLAYS COBBLES BOULDERS <br /> FINE MEDIUM COARSE FI=COARSE <br /> GRAIN SIZES <br /> -. Std,Pen 2'ID SS POCKET 2 Sid,Pent 2'ID SS <br /> SANDS&GRAVELS BLOWSlFTt BLOWSfFT SILTS&CLAYS PENETROMETER BLOWSIFT BLOWSIFT <br /> VERY LOOSE 0 - 4 0 - T <br /> VERY SOFT 0 250 0 - 2 0 3 <br /> LOOSE 4 10 7 16 SOFT 250 - 500 2 - 4 3 - 6 <br /> - - <br /> MEDIUM DENSE 10 - 30 16 50 FIRM 500 - 1,000 4 - 8 6 • 13 <br /> DENSE 30 50 50 - 03 STIFF 1,000 - 2,000 8 16 13 26 <br /> 2,000 - 4,000 ifi - 32 26 - 53 <br /> VERY DENSE OVER 50 OVER 83 <br /> VERY STIFF <br /> HARD OVER 4,900 OVER 32 OVER 53 <br /> RELATIVE DENSITY Correction <br /> i.+ CONSISTENCY Factor-.6 <br /> .', <br /> Number a1 blows of 140-pound hammer lalling 30 inches to drive a 2-inch O.D.(1-318 inch LD.)split spoon(ASTM D-1586). <br /> 2Unconfined compressive strength in tons/sq,It. as determined by laboratory testing or approximated by the standard <br /> penetration test(ASTM D-1586), pocket penetrometer,totvane,or visual observation. <br /> gra <br /> rrwu <br />