Transcription of Soil Classification - Jim Richardson
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Soil Classification - Jim Richardson
CE 340, Fall 2015 Soil Classification 1 / 7 The geotechnical engineer predicts the behavior of soils for his or her clients (structural engineers, architects, contractors, etc). A first step is to classify the soil. Soil is typically classified according to its distribution of grain sizes, its plasticity, and its relative density or stiffness. Classification by Distribution of Grain Sizes. While an experienced geotechnical engineer can visually examine a soil sample and estimate its grain size distribution, a more accurate determination can be made by performing a sieve analysis. Sieve Analyis. In a sieve analysis, the dried soil sample is placed in the top of a stacked set of sieves. The sieve with the largest opening is placed on top, and sieves with successively smaller openings are placed below. The sieve number indicates the number of openings per linear inch ( a #4 sieve has 4 openings per linear inch).
CE 340, Fall 2015 Soil Classification 5 / 7 Example #1, Soil Classification Using Results of Sieve Analysis. Write the soil classification based on the following sieve analysis results: 40 g retained on the #4 sieve, 72 g
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