ENCV3G1 SI SESSIONS
13 March 2023
Questions:
1. The laboratory gradation analyses and Atterberg limits were performed on two soil
samples. Results are summarised below.
a) Classify soil A and B according to the USCS.
2. A sieve analysis was performed on a 2000g soil sample. Using the information given
below:
a) Plot the particle distribution curve.
Sieve
diameter
(mm)
Mass
Retained(g)
b)
c)
d)
e)
4.75
2.0
0.85
0.425
0.25
0.15
0.075
Pan
0
490
897
294
212
129
159
19
Is this a coarse or fine-grained soil? Substantiate your answer.
Determine the shape parameters D10, D30 and D60 using the curve.
Calculate Cu and Cc
Finally, classify the soil according to USCS.
3. A sample of soil has the following characteristics.
% Passing No.4 sieve – 95
% Passing No.200 sieve- 57
LL- 37
PL-18
a) What is the AASHTO classification for this soil sample?
b) What dos the group index of a soil tell us.
c) Determine the group index number of this soil.