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Unformatted text preview: causing the smaller grains of soil to fall through the large holes until they are as large as the holes. After this data is collected, a percent can be made from the total soil. This is done by taking the soil in each layer divided by the total soil, this is called the percent finer. After this percentage is found, a table from the United States Geological Survey (USGS) classifies the soil. From this data a grain size distribution curve can be formed (Figure 3). The smallest sieve size is #200, so if there is a soil sample with grains smaller than this, they cannot be classified using this method. The basic theory is particles will be separated based on their sizes using different sieves. Figure 1: Various sieves. Courtesy of Jepson Bolton Ltd Figure 2: Sample set up. Courtesy of W.S.Tyler Group. Figure 3: Sample Grain Size Distribution Curve Grain Size Distribution Curve 20 40 60 80 100 4.75 1.25 0.84 0.42 0.15 0.075 Patilce Size (mm) Percent Finer...
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This note was uploaded on 04/29/2008 for the course ENGL 341 taught by Professor Rowe during the Summer '07 term at NMT.
- Summer '07