Typically, this data will be plotted on a grain-sized distribution chart like th
ID: 105269 • Letter: T
Question
Typically, this data will be plotted on a grain-sized distribution chart like the one shown below. From this curve, you can determine the following values: D_10. D_30, and D_60 as follows: On the y-axis. locate the line corresponding to 10% finer. Trace horizontally along this line until you intersect the grain-sized distribution curve and determine the grain size (x-axis) that corresponds to this value. This is D_10. D_30 and D_60 are similarly determined by tracing along the y-axis lines corresponding to 30% finer and 60% finer. Record these values below. Using the equations shown on Page 1. calculate C_u and C_c. A sandy soil is considered well graded if C_u greaterthanorequalto 6 AND 1Explanation / Answer
2. From graph, D10 = 0.001 mm D30= 0.02 mm D60= 0.25 mm
3. Cu = D60/ D10 = 0.25/0.001 = 250
Cc = D302 / (D60* D10) = 0.022 / (0.25 *0.001) = 1.6
4. Well-graded
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