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Review Course Section Quiz 03
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1. What height retaining wall must be built to resist a total earth pressure force of 5,000 lbs. if the total unit weight of the soil is 135 pcf and has a friction value of 24 degrees?
a. 10.50 ft
b. 12.75 ft
c. 13.25 ft
d. 15.00 ft
2. Determine the unit weight (
ɣ
, in lb/ft
^{3}
) and the dry unit weight ((
ɣ
_{d}
, in lb/ft
^{3}
) of a soil with the following conditions: Standard Proctor test weight (W) = 4.80 lbs. and Moisture content (w) = 10.77%. Volume of a Standard Proctor mold (V) = 1/30 ft
^{3}
a. 144 pcf, 130 pcf
b. 144 pcf, 115 pcf
c. 130 pcf, 115 pcf
d. 115 pcf, 144 pcf
3. What is the degree of saturation (S) of the following soil? Maximum dry density = 130 pcf, Optimum Moisture Content = 10.77%, Specific gravity of the solids (G
_{s}
) = 6.35. Unit weight of water (
ɣ
_{w}
) is 62.4 pcf
a. 10%
b. 25%
c. 33%
d. 40%
4. In the drawing shown, what is the total pressure at the point shown? The pore water pressure = 3.121 psi and Z
_{w}
= Z
_{2}
and Z
_{1}
= 30 ft.
a. 1,368.6 psf
b. 1,561.5 psf
c. 1,926.2 psf
d. 2,067.4 psf
5. A 20 ft thick layer of consolidated clay has a 5 ft thick layer of sand on top and a 15 ft thick layer of sand beneath. How much time is required to reach 95% consolidation in a soil with a consolidation coefficient (c
_{v}
) of 0.5 ft
^{2}
/day?
a. 205 days
b. 194 days
c. 179 days
d. 162 days
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