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111 <br /> MAJOR DIVISIONS SYMBOLS <br /> TYPICAL NAMES <br /> GW g <br /> Well-graded ravels or gravel sand mixtures, little or no fines <br /> ` o _ GRAVELS g <br /> t» H N GP Poorly graded gravels or gravel-sand mixtures, little or no fines <br /> O o (More than h of coarseI <br /> m <br /> fraction>no.4sieve size) GM Silty gravels, gravel-sand-silt mixtures <br /> X m GC Clayey gravels, grave!-sand-sandmixtures <br /> c , { <br /> m N SW well-graded sands or gravelly',sands, little or no fines i <br /> Q� n SANDS SP <br /> Poorly graded sands or gravelly sands, little or no fines <br /> 0 (More than %4 of coarse SM <br /> Silty sands, Sand-Sift mixtures <br /> U fraction<no.4sievesize) i <br /> F Sc Clayey sands,sand-clay mixtures i <br /> i <br /> ML Inorganic silts and very fine sands,rock flour,silty or clayey fine sands or clayey silts with ) <br /> .o °'W.0 SILTS & CLAYS slight plasticity I� <br /> N CL Inorganic clays of low to mediumlasticit <br /> I w LL C 50 lean clays P Y. gravelly clays, sandy clays, silty clays, I <br /> i <br /> Lo OL Organic silts and organic silty'lclays of low plasticity <br /> crCy <br /> t o <br /> t7 i MH Inorganic silts, micaceous or diatomaceous fine sandy or silty soils, elastic silts i <br /> i, <br /> w0 SILTS & CLAYS <br /> U_ v LL > 50 CH Inorganic clays of high Plasticity, fat clays <br /> OH ) <br /> Organic clays of medium to high plasticity, organic silty clay, organic silts <br /> HIGHLY ORGANIC SOILSi <br /> Ft Peat and other highly organic sails <br /> ) <br /> t UNIFIED SOIL CLASSIFICATION SYSTEM <br /> i <br /> i;. <br /> COHESIVE SOILS GRANULAR SOILS CLASSIFICATION RANGE OF GRAIN SIZES <br /> Description blows/ft. Description Blows/ft. U.S. Standard Grain Size <br /> Grain Type j <br /> very soft Z very loose Sieve Size in Millimeters J <br /> soft < Boulders; above 12" above 305 <br /> 2-4 loose 5- 10 , <br /> medium(firm) 5-8 medium dense 11 -30 Cobbles I 72"to 3" 305 to 76.2 <br /> Gravel 76.2 to 4.76 <br /> - stiff �� 3"to no. 4 t <br /> 9- 1 5 dense 31 -50 coarse (C) 3"to V. 76.2 to 19-1 <br /> verystiff 50 fine (f) y,"to no.4 19.1 to 4.76 M <br /> 16-3 a very dense � <br /> hard > 30 Sand i no. 4 to no. 200 4.76 to 0.074 <br /> coarse {C) no.4 to no. 10 4.76 to 2.00 <br /> medium (m) no. 10 to no.40 2.00 to 0.420 <br /> fine (f) no.40 to no.200 0.420 to 0.074 <br /> CONSISTENCY CLASSIFICATION Sift &Clay below no. 200 below 0.074 <br /> GRAIN SIZE CLASSIFICATION <br /> ii <br /> 60 !a <br /> so <br /> W <br /> CH it <br /> z 40 \r,F <br /> U 30 'I <br /> 20 CL CH iI l <br /> J [; Ii F <br /> 10 <br /> 7 CL—Mi MH <br /> 4 ML <br /> G <br /> 0 10 20 30 40 50, 60 70 8d 90 100 ' <br /> ' LIQUID LIMIT <br /> PLASTICITY CHART YY <br />