G1-Lecture12-Soil-Classification

G1-Lecture12-Soil-Classification - CEGCEG-4011 Geotechnical...

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CEG CEG-4011 Geotechnical Engineering I 4011 Geotechnical Engineering I Lecture #12 Classification of Soils - The Unified Soil Classification System (USCS) - The AASHTO System L. Prieto-Portar 2010
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The U.S. Army Corps of Engineers used this triangular chart for soil classification in 1943.
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Arthur Casagrande was born (August 28, 1902) and educated in Austria. He immigrated to the United States in 1926 to accept a research assistantship with the Bureau of Public Roads to work under Karl Terzaghi at M.I.T. While at M.I.T., Professor Casagrande worked on soil classification, shear testing, and frost action in soils. In 1932 he initiated a program in soil mechanics at Harvard University. Professor Casagrande's work on soil classification, seepage through earth structures, and shear strength has had major influence on soil mechanics. Professor Casagrande has been a very active consultant and has participated in many important jobs through-out the world. His most important influence on soil mechanics, however, has been through his teaching at Harvard. Many of the leaders in soil mechanics were inspired while they were his students at Harvard University.
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Peats are so abundant in Scotland that they are used to distill whiskey and to heat homes.
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Group names for gravelly soil*. Group Symbol Criteria for group name: SF a Group name GW < 15 Well-graded gravel 15 Well-graded gravel with sand GP < 15 Poorly graded gravel 15 Poorly graded gravel with sand GM < 15 Silty gravel 15 Silty gravel with sand GC < 15 Clayey gravel 15 Clayey gravel with sand GC-GM < 15 Silty, clayey gravel 15 Silty, clayey gravel with sand GW-GM < 15 Well-graded gravel with silt 15 Well-graded gravel with silt and sand GW-GC < 15 Well-graded gravel with clay 15 Well-graded gravel with clay and sand GP-GM < 15 Poorly graded gravel with silt 15 Poorly graded gravel with silt and sand GP-GC < 15 Poorly graded gravel with clay 15 Poorly graded gravel with clay and sand _______________________________________________________________________________ * Based on ASTM D-2487 a SF = sand fraction = R 200 - GF , and GF = R 4
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The Unified Soil Classification System - Group symbols for sandy soil. (R200 > 50; R4 / R200
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G1-Lecture12-Soil-Classification - CEGCEG-4011 Geotechnical...

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