4 0 obj 650 0 obj <>/Filter/FlateDecode/ID[<99ADFF17EDEC494E9694F40903CB8081><3144012DFDFCFC45A63D3AAE4973F3C3>]/Index[630 31]/Info 629 0 R/Length 103/Prev 241287/Root 631 0 R/Size 661/Type/XRef/W[1 3 1]>>stream %���� zones by using the USCS classification. USCS Soil Classification Chart endobj h�bbd```b``�"&�H��`W��L��|`v2�d� ���`�L��U�\Q ��>X����$Y�����JL�L�`{I �30t� 0 ,C <> endstream endobj 631 0 obj <>/Metadata 35 0 R/Outlines 59 0 R/Pages 628 0 R/StructTreeRoot 71 0 R/Type/Catalog>> endobj 632 0 obj <>/Font<>/Pattern<>>>/Rotate 0/StructParents 0/Tabs/S/Type/Page>> endobj 633 0 obj <>stream bUXZi�� ���_h��`і/�CM��Ҕ��S$����/�F6��*"i�6�y�;�NK���آ16sY�rf�e�ҍT�h����t��m�?��q X��RtƣM�d�! 55, January 2012) Table 3–9 USCS components and modifiers 3–15 Table 3–10 Soil components and significant properties 3–16 Table 3–11 Gradation descriptors for coarse-grained soils 3–18 Table 3–12 Manual field test procedures for the engineering 3–25 ��b`.���n�]!��\*�9���EU���A�r b� 3 0 obj Soil classification procedure is summarized in Figure 5.1 and 5.2. ~�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�� %%EOF ����-��&�������� 3. �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. endobj 1 0 obj Determining the Unified Soil Classification System (USCS) Symbol and Group Name with Modifier using lab data (ASTM D2487) stream 4 0 obj %���� endobj 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. stream <> significant components in the soil. endstream endobj startxref If a material is predominantly (>50% by weight) fine-grained, it … The system uses soil’s gradation information and plasticity characteristics (LL, PL, PI) for the classification. 2 0 obj �ų���5Q�. <> <>>> Refer to the flow chart in the handout. $588�\� 朗`�A:��>pt�)ܝ�bq Ӧ�]�&WLoP��h̲�a�� �����A��h Refer to tables … ��`Yv _y���,�X&�1���� �Β�v?� �o���,�4��!ˮpd�f_M ,́�ʣ�����_Ɋ�Ag�9��i0��D�M���l��Ï�F���ŪD}pb� �m�F��ğ�8�PLa$/�~�qh@,a����R��P�@���F�?P��c;]'E�\�����(q���?%7. h�b``b``������A��b�,"Q <>>> 41. endobj <>/XObject<>/ProcSet[/PDF/Text/ImageB/ImageC/ImageI] >>/MediaBox[ 0 0 792 612] /Contents 4 0 R/Group<>/Tabs/S/StructParents 0>> endobj <>/ProcSet[/PDF/Text/ImageB/ImageC/ImageI] >>/MediaBox[ 0 0 595.32 841.92] /Contents 4 0 R/Group<>/Tabs/S/StructParents 0>> 630 0 obj <> endobj 0 Tests to Characterize Coarse-Grained Soils Visual Examination Determine whether G or S is predominant * 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. %PDF-1.5 `�p8v� <> 3 0 obj 660 0 obj <>stream %PDF-1.5 1 0 obj endobj conditions. 2. Unified Soil Classification System (USCS). �Z��5m�4A�������"`�"���s�Ͼ�֊�80j����^�W ��^�5an�1���S��AL3 �Ǥ�9 ������[�-���/�qR��yQ-p8���lk Cw��dPW�1\�`$?�� �H��y3��鄜�zݼqsВ�tBF��n]M����\�1S�I/�;u�b��HJ��u *Ƞ� �v��cx ��;�WE�xЫW���j`����tӐ1�`9�W�\|]�/?ŀ�fGݺ�G@���ϖ�^��2��6)RJ�|^�N�(P�y�����d�x�"6�a]��zM�7[S��)nź�e�ޞ��*Q as�� �d�7>d4^߻�ڸ�^���0T��2���~�L�DR��R��F�`ZǦ� ���Š���|�۸'+#h� �\EKQ�}�4%u�)�� For coarse-grained soils, the erodibility is influenced mostly by gravity forces and therefore by the grain size. 2 0 obj %PDF-1.6 %���� 4. )M���OԨ. If a soil is a sand, the same steps and criteria are used as for gravels in order to determine whether the soil is a well-graded clean sand (SW), poorly-graded clean sand (SP), sand with silty fines (SM) or sand with clayey fines (SC). hެTmO�0�+�41��DB��B� x��Z[o۸~���G�aś(-����z����}8hσ_��#�Dv�9���II�-��b��g��p8L���ի��Ǔ�Q��u���8z3��z��G\�TE����R��#�$�Ed�a2�=\_���~}�%�1�kv����oQ"c��'��y}uܐ�硅dJtx|��it�~E�xG*�CÄ�������cr#� �|��FIO��D��&��ng�L���e0�fL���� Figure 5.1: USCS flowchart 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. 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. ����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���� 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���� In 1952, the Bureau of Reclamation (Reclamation) and the U.S. Part 631 National Engineering Handbook Engineering Classification of Earth Materials Chapter 3 3–iv (210–VI–NEH, Amend.

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