CE 345 – Introduction to Soil Mechanics
DUE 09/08/2023
HOMEWORK 1
1.) What is the uniformity coefficient and the coefficient of degradation of a gravelly soil with
D60 = 0.48mm, D30 = 0.25mm, and D10 = 0.11mmm?
2.) Determine the uniformity coefficient and the coefficient of degradation for the three soils
shown in the graph below.
3.) Please use the sieve analysis shown below:
a) Plot the grain size distribution curve and perform the necessary analyses to get all
values needed.
b) Determine D10, D30, D60 for each soil
c) Calculate the uniformity coefficient Cu.
d) Calculate the Coefficient of gradation Cc.
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4.) Repeat Problem 3 for the following sieve analysis:
5.) The results of a sieve and hydrometer analysis are as follows.
a. Draw the grain size distribution curve
b. Determine the % of gravel, silt, sand, and clay according to the MIT, USDA, and
AASHTO system
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