Soil Sample

Discussion D10 = 0. 078mm D30 = 0. 125mm D60 = 0. 55mm Cc = (D30)2 / D10 x D60 = 0. 1252 / 0. 55 x 0. 078 = 0. 36422 < 1 Cu = D60 / D10 = 0. 55 / 0. 078 =7. 0513 > 6 If a soil is well- class-conscious, it should pay off 1 < Cc < 3 Cu > 4 (for gravels) Cu > 6 (for sand) Note that, from our outcome, Cc is much smaller than one. So by the constraints 1 < Cc < 3, we fanny conclude that the evidenceing soil is non well- range, scarce gravely graded. And the Cu obtained is 7. 0513 > 6, which implies that the sample should be sand but not gravels. Furthermore, we whitethorn classify the sample following the t fitting below accuratelyAs we see our sample contains 17. 16% of gravel which satisfy the constraints of gravelly sand. So we may further conclude that the sample is poorly-graded gravelly sand. (3) For the engineer application of results, we may see that as sieve analysis test (dry sieve) results in gradation of sample in well-graded or poorly graded on the ba sis of their particle sizes and its size distribution, so the result can be an indicator of other engineer properties such as compressibility, lop strength, and hydraulic conductivity which is important in construction engineering and geotechnical engineering.In an engineering design, the gradation of soil often controls the design and ground water waste pipe of the site. For example a poorly graded soil will beat better drainage than a well graded soil because at that place are more void spaces in a poorly graded soil. And other example is a well graded soil is able to be compacted more than a poorly graded soil. Most types of projects may have gradation requirements that must be met before the soil to be used is accepted.Conclusion From the above result, the sample is classified as poorly-graded gravelly sand. The result is useful for the type of use of the site in further development. These poorly graded stone is good for drainage but not as a kind of foundation support. The importance of the gradation of soil is understand so that soil can be based in different use and will not induce unwanted accident in construction engineering or geotechnical engineering.