If a soil is a sand, the same steps and criteria are used as for gravels in order to determine whether the soil is a well-graded clean sand (SW), poorly-graded clean sand (SP), sand with silty fines (SM) or sand with clayey fines (SC). Determining the Unified Soil Classification System (USCS) Symbol and Group Name with Modifier using lab data (ASTM D2487) 4 0 obj �ų���5Q�. endstream endobj 631 0 obj <>/Metadata 35 0 R/Outlines 59 0 R/Pages 628 0 R/StructTreeRoot 71 0 R/Type/Catalog>> endobj 632 0 obj <>/Font<>/Pattern<>>>/Rotate 0/StructParents 0/Tabs/S/Type/Page>> endobj 633 0 obj <>stream 3 0 obj stream USCS Soil Classification Chart The system uses soil’s gradation information and plasticity characteristics (LL, PL, PI) for the classification. endstream endobj startxref <>/XObject<>/ProcSet[/PDF/Text/ImageB/ImageC/ImageI] >>/MediaBox[ 0 0 792 612] /Contents 4 0 R/Group<>/Tabs/S/StructParents 0>> ����-��&�������� %%EOF 1 0 obj %PDF-1.5 3 0 obj zones by using the USCS classification. Refer to the flow chart in the handout. ��`Yv _y���,�X&�1���� �Β�v?� �o���,�4��!ˮpd�f_M ,́�ʣ�����_Ɋ�Ag�9��i0��D�M���l��Ï�F���ŪD}pb� �m�F��ğ�8�PLa$/�~�qh@,a����R��P�@���F�?P��c;]'E�\�����(q���?%7. hެTmO�0�+�41��DB��B� �L�I�.D����M#F�Eƥ���4ޚ@�[@�����y�2�X�6.���H0x�G4W��6lh�a�9�>�lI`G���X��h��}���C�����[C��u'�,�յ����~]�$�R�K�R. <>>> 1 0 obj significant components in the soil. h�bbd```b``�"&�H��`W��L��|`v2�d� ���`�L��U�\Q ��>X����$Y�����JL�L�`{I �30t� 0 ,C Knowledge of soil classification, including typical engineering properties of various soil groups, is especially valuable when prospecting for earth materials or investigating foundations for structures. <> conditions. Chart ML-CL Above line on Plasticity Chart and PI> 7 CL LL ≥ 50 Below line on Plasticity Chart Color or odor Organic OH Inorganic MH Above line on Plasticity Chart CH Highly Organic Soils (Pt) Color, odor, very high moisture content, particles of plant life, fibrous. h�b``b``������A��b�,"Q 0 For coarse-grained soils, the erodibility is influenced mostly by gravity forces and therefore by the grain size. Soil classification procedure is summarized in Figure 5.1 and 5.2. 3. If a material is predominantly (>50% by weight) fine-grained, it … ��b`.���n�]!��\*�9���EU���A�r b� %���� * To use this chart, start on the top and work your way down using the steps to guide you to the appropriate USCS Symbol, Group Name, and Modifier. endobj `�p8v� ����C�M�g�}�S�A��w��C����믧nK ��M>պ7�� �I�m5�ު�U0��i2��h��-C�9z>2�@̇��'6�X�id�0y���y��6��a����X ,e��w�0]z�'`{�z����q��0dP�B�� ���V�x��{���GS�_�x��q#-�H�3�]�� hA�Q��~p !BpTݖ 指�Xf�����ʕn�x�zm'@��u�*(0]Պ�r��4���� $588�\� 朗`�A:��>pt�)ܝ�bq Ӧ�]�&WLoP��h̲�a�� �����A��h 630 0 obj <> endobj 4. <> %PDF-1.6 %���� )M���OԨ. %PDF-1.5 x��Z[o۸~���G�aś(-����z����}8hσ_��#�Dv�9���II�-��b��g��p8L���ի��Ǔ�Q��u���8z3��z��G\�TE����R��#�$�Ed�a2�=\_���~}�%�1�kv����oQ"c��'��y}uܐ�硅dJtx|��it�~E�xG*�CÄ�������cr#� �|��FIO��D��&��ng�L���e0�fL���� Refer to tables … Figure 3-2 is a flow chart for assigning typical names and group symbols for inorganic fine-grained soils; figure 3-3 is a flow chart for organic fine-grained soils; figure 3-4 is a flow chart for coarse-grained soils. bUXZi�� ���_h��`і/�CM��Ҕ��S$����/�F6��*"i�6�y�;�NK���آ16sY�rf�e�ҍT�h����t��m�?��q X��RtƣM�d�! endobj endobj 2. <>>> 4 0 obj <> 2 0 obj stream Figure 5.1: USCS flowchart Part 631 National Engineering Handbook Engineering Classification of Earth Materials Chapter 3 3–iv (210–VI–NEH, Amend. %���� endobj ~�4�ů�/o�o��]������O����M���|�tMǷ�l����t6�aj������zH�#���x�.~ ��;z�Ư��߆�$�[$8M$�Ό�'~{i.~�����hd�������8�zE�O��s�Y�wen��R�_:���d�W�fo>b�?b��ny�7D�G+����xa��q�o��M�R�׏�&^�7��}��~����k���a��5��j����c�\�u���_��~|˭�/Z������N�ʒ�?̦G 4�#��?y�S�uς3=1�֦]G�3@iۏ����f\}T ���ٳ`�(ڇ�F�� ��zB�� x��][�ݶ�~W��_R5�Qĝ�ry+�s�8��yp�0�%K��8��Y�����h�<<3gN\�{�f�h4��Ƌ�|�������O_�����wo��}�������?^|�ˏo^|}���۫��w��}�}�����o>y��w��}��7o?y����S�7�w�W�l���'φ����O�}{�����p��\����x�~��^����xq�=��}s�\ًwo���2���� endobj Tests to Characterize Coarse-Grained Soils Visual Examination Determine whether G or S is predominant In 1952, the Bureau of Reclamation (Reclamation) and the U.S. <>/ProcSet[/PDF/Text/ImageB/ImageC/ImageI] >>/MediaBox[ 0 0 595.32 841.92] /Contents 4 0 R/Group<>/Tabs/S/StructParents 0>>

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