CE180 (Spring 16)
HW#7 Solution Key
Problem 1 (20 Points)
Three direct shear tests are conducted on identical clay samples under different normal loads.
The applied normal stress (), the measured shear stress at failure (f), and the pore water pressure at
CE180 (Spring 15)
Homework # 2
Due date: 2/9
Problem 1 (30 points)
A) Classify the following soils using the Unified Soil Classification System. Give the group symbol and
the group name. Neatly and carefully plot all five particle distribution curves on t
CE180 (Spring 16)
Homework No.1
Solution Key
Problem 1 (20 points)
A sample of saturated silt is 10 cm in diameter and 2.5 cm thick. Its void ratio in this state is 1.35, and the
specific gravity of solids is 2.70. The sample is compressed to 2cm thicknes
CE180 (Spring 16)
Homework # 3
Problem 1 (30 points)
You are the earthwork construction control inspector and you are checking the field compaction of a layer
of soil. The laboratory compaction curve for the soil is shown below. Specifications call for th
CE180 (Spring 15)
HW # 5 Solution Key
Problem 1 (20 points)
For the soil profile shown below, plot the variation of total stress, pore water pressure, and effective stress
with depth. (Assume Gs=2.7)
1
3.2 m
Dry sand ; d =17 kN/m3
GWT
2
Fine sand: e =0.74
CE180 (Spring 16)
HW # 4
Problem 1 (20 points)
Determine the total head, elevation head, and pressure head at all points indicated on the figure below (A
through F). Report your results in a table format. Also, plot the variation of total, elevation, and
CE180 (Spring 16)
HW # 6 solution
Problem 1 (30 points)
A rectangular foundation (8x6 ft) carrying an axial load of 350 Kips is constructed on the soil profile shown
below. Determine:
350 kips
8 ft
dry sand
5 ft
d =110 Pcf
GWT
15 ft
sand
sat =115 Pcf
NC C