Appendix B The Unified Soil Classification System
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. Nearly every engineer whopractices soil mechanics will add judgment and personal experience asmodifiers to whatever soil Classification System he uses. Obviously, withina given agency (where designs and plans are reviewed by persons entirelyremoved from a project) a common basis of soil Classification is necessaryso that when an engineer classifies a soil as a certain type, thisclassification will convey the proper characteristics and behavior of thematerial.
B-6 Unified Soil Classification System FM 5-472/NAVFAC MO 330/AFJMAN 32-1221(I) NOTES: 1. Values in columns 7 and 11 are for guidance only. Design should be based on actual test results.
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