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. 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.
The adoption of the principles of soil mechanics by the engineering ... B-2 Unified Soil Classification System ... intermediate sizes lacking (sometimes called skip …
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