Soil Classification

Problem $1\mathrm{.}1$: Given a soil sample with the following sieve analysis results:

Sieve No$.4(4\mathrm{.}75mm)$:$25\%$

Sieve No$.10(2\mathrm{.}00mm)$:$45\%$

Sieve No$.40(0\mathrm{.}425mm)$:$20\%$

Sieve No$.200(0\mathrm{.}075mm)$:$10\%$

Determine the soil classification according to the Unified Soil Classification System $($USCS$).$ Identify

whether the soil is a Gravel, Sand, Silt, or Clay, and specify the subgroup.

Solution Approach: Calculate the percentages of coarse and fine particles, then determine the soil

type based on the USCS chart. Use the particle size distribution to classify the soil into gravelly or

sandy, and further classify into well$-$graded or poorly graded if necessary.