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description assignment

# description assignment - causing the smaller grains of soil...

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Vanessa Barela July 10, 2007 English 341 Description Assignment Particle size analysis is a method for classifying soil using different size bins called sieves (Figure 1). The purpose of this method is to determine the size of the grains within a soil sample and classify the soil. The sieve analysis method also allows different sizes of soil to be determined within one sample and be compared to the rest of the sample to form a grain size distribution (GSD) curve. This information is useful for engineers because they use this information when building roads or any structures to make sure that the ground they build on is solid and the structures they build will not fall. The basic way sieve analysis works is that pans called sieves are stacked on top of each other with the larger holes on the top and the smaller holes on the bottom. The sieves are put on top of a pan to catch the soil. Soil is added to the top layer of the stack and the sieves are placed on a device that shakes the bins (Figure 2). This shaking motion causes the soil to separate by

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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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