Appendix B The Unified Soil Classification System

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Unified soil Classification System B-1Appendix 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.

Unified Soil Classification System B-5 FM 5-472/NAVFAC MO 330/AFJMAN 32-1221(I) Coarse-Grained Soils In the following paragraphs, soils of the GW, GP, SW, and SP groups are

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