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CLASSIFICATION OF SOILS FOR ENGINEERING PURPOSES <br /> (ASTM: D 2487 and 2488) <br /> Major divfsions Group Typical names Laboratory classlfication criteria <br /> symbols <br /> ^m Well-graded gravels,gravel-sand �so ��30�2 <br /> m a+ GW C„=—greater than 4;C�= between 1 and 3 <br /> d S miztures,Iittle or no flnes <br /> a �� c � �io ��oX�so <br /> V M � O � C <br /> �» N N O� � <br /> a� � U z GP Poorly graded gravels, gravel- d � <br /> �, m � � � Not meeting all gradatlon requlrements for GW <br /> � o ,� sand mixtures,Ilttle or no fines o V N <br /> W ��� � N y q <br /> � O tv <br /> N �r Z N 3� J <br /> C! C7�i0 C - d �H N y C <br /> y �� d a GM Silty gravels, gravel-sand-silt � ��m a Atterberg Ifmits below "A" <br /> 00 � � w �� mixtures 'N 3r�o T Iine or P.I.less than 4 Above "A" Iine wlth P.i. <br /> N ` � <br /> 0 0 1O �a � u �N ��m '" between 4 and 7 are 6order- <br /> 2 � a A� � o <br /> y � � �o d Z llne cases requiring use <br /> ,°n= � a GC Clayey gravels,gravel-sand-clay h A Atterberg limits below "A" of dual symbols <br /> � m �Q mixtures �;L Ilne or P.I.greater than 7 <br /> c P� rn°1 <br /> a_ E m <br /> �� � N <br /> �!� � � �so (�30)2 <br /> ,� Well-graded sands, gravelly d g <br /> o�! y d SW ��� C�=—greater tha�6;C� between 1 and 3 <br /> A a� sands,little or no fl�es A <br /> V � c � 0 9� �to �toX�so <br /> `o od '� c cy <br /> �y C 10 N <br /> jp `y �p O 9 C <br /> t CI d d C` . <br /> W d V: SP Poorly graded sands, gravelty �o ; ; ; <br /> Y �•;� v a, o • Not meeting all gradatfon requirements for SW <br /> m sands,little or no fines � rn= c � <br /> d o�* m m o� a+ <br /> N V �, y C� y U . <br /> � C O Z �U � V y . <br /> A a C <br /> y L.t C d � a,�6_1 a.N- c�,t <br /> y � c'm'^ � Atterber Iimlts below "A" <br /> � y d o SM Silty sands,sand-silt mixtures �' o a � m �' 9 <br /> c� S �� d ��«�N line or P.I.less than 4 Limits plotting in hatched <br /> a, E r d ; � . �� d a, �� zone with P.I. between 4 <br /> m O <br /> �h 3�� d a�, ���� and 7 are borderllne cases <br /> a `o °1 d'o requfring use of dual sym- <br /> ya SC Clayey sands, sand-clay mix- �� '" Atterberg limits below "A" bols. <br /> ¢ tures Nne or P.I.greater than 7 <br /> Inorganic silts and very fine <br /> ML sands, rock flour, silty or clay- <br /> � ey fine sands or clayey silts <br /> � with slight plasticity 60 — <br /> W� Inorganfc clays o( low to me- For classification ol fine-gralned <br /> � � soils and fine fractlon of coarse- <br /> y d dium plasUcity, gravelly clays, <br /> �-- C� 50 9rained soils. <br /> e, '�'— sandy clays, silfy clays, lean <br /> � _ E Atterberg limits plotting In <br /> clays hatched area are borderline classi- <br /> g y P flcatfons requiring use of dual <br /> "' v 40 symbols <br /> d Organic silts and organic ailty k <br /> Z OL y Equation ot A-Iine: <br /> � clays of low plasticity � PI=0.73(LL-20) <br /> t � <br /> `—" � �30 <br /> $� Inorganic silts, mtcaceous or A e <br /> c y MH diatomaceous }ine sandy or a p;��c <br /> �� � slity soils,elastic silts 20 ° OH and MH <br /> �Z A <br /> d h r <br /> LL10 �d CL <br /> E <br /> o � ` CH Inorganic clays of high plas- �� <br /> ;� w °1 tieity,fat clays <br /> L ='E �-------- � <br /> m m= CL-ML �,� ML and OL <br /> t v 4------- ; <br /> � <br /> o � Organlc clays of inedium to 0 � <br /> � OH higli plasticity,organ(c silts 0 10 20 30 40 50 60 70 80 90 100 <br /> Llquid Limit <br /> ��_ Pt Peat and other highly organic PlastiCity Chaft <br /> = Q�: soll <br /> 0 <br />