Transcription of Appendix B The Unified Soil Classification System
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Unified soil Classification System B-1 Appendix BThe Unified soil Classification SystemThe adoption of the principles of soil mechanics by the engineeringprofession has inspired numerous attempts to devise a simpleclassification System that will tell the engineer the properties of a givensoil. As a consequence, many classifications have come into existencebased on certain properties of soils such as texture, plasticity, strength,and other characteristics. A few Classification systems have gained fairlywide acceptance, but rarely has any System provided the completeinformation on a soil that the engineer needs. Nearly every engineer whopractices soil mechanics will add judgment and personal experience asmodifiers to whatever soil Classification System he uses.
system and the group symbols that distinguish the individual soil types. Names of typical and representative soil types found in each group are shown in column 6. SOIL GROUPS AND GROUP SYMBOLS Soils are primarily identified as coarse grained, fine grained, and highly organic. On a textural basis, coarse-grained soils are those that have 50
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