#160.
A uniform soil deposit has a dry unit weight of \(15.6 kN/m^3\) and a saturated unit weight of
\(17.2 kN/m^3\). The groundwater table is at a distance of 4 m below the ground surface. What will happen to the effective stresses at A if the ground water surface
will rise up the ground surface?
A
Unchanged
B
Increase
C
Remain
D
Decrease
Answer: Decrease
#161.
A soil sample was determined in the laboratory to have a liquid limit of 41% and a plastic
limit of 21.1%. If the water content is 30%. Determine the plasticity index.
A
11.1
B
9.9
C
21.1
D
19.9
Answer: 19.9
#162.
A soil sample was determined in the laboratory to have a liquid limit of 41% and a plastic
limit of 21.1%. If the water content is 30%. Determine the liquidity index.
A
0.507
B
0.608
C
0.394
D
0.447
Answer: 0.447
#163.
A soil sample was determined in the laboratory to have a liquid limit of 41% and a plastic
limit of 21.1%. If the water content is 30%. What is the characteristic of soil?
A
Brittle
B
Liquid
C
Dense
D
Plastic
Answer: Plastic
#164.
A consolidated drained triaxial test was conducted on a normally consolidated clay. The
results as follows: Chamber confining pressure: 138 kPa Deviator Stress = 258 kPa.
Compute the friction angle of the soil.
A
35.15 o
B
28.89 o
C
21.07 o
D
32.55 o
Answer: 28.89 o
#165.
A consolidated drained triaxial test was conducted on a normally consolidated clay. The
results as follows: Chamber confining pressure: 138 kPa Deviator Stress = 258 kPa.
Compute the normal stress at failure.
A
212.59 kPa
B
278.87 kPa
C
255.15 kPa
D
204.68 kPa
Answer: 204.68 kPa
#166.
A consolidated drained triaxial test was conducted on a normally consolidated clay. The
results as follows: Chamber confining pressure: 138 kPa Deviator Stress = 258 kPa.
Compute the shear stress at failure.
A
112.95 kPa
B
137.15 kPa
C
108.53 kPa
D
111.31 kPa
Answer: 112.95 kPa
#167.
A certain soil deposit has a liquid limit of 47% and a plastic limit of 24%.
Compute the coefficient of earth pressure at rest of this soil deposit. Hint: Ko = 0.19 + 0.223log(PI).
A
0.507
B
0.447
C
0.239
D
0.319
Answer: 0.507
#168.
A certain soil deposit has a Ko = 0.507, a liquid limit of 47%, and a plastic limit of 24%. Compute the total stress at rest lateral earth pressure at a depth of 5 m. in a dense sand deposit where
this soil was obtained. The unit weight of sand is \(18.4 kN/m^3\).
A
45.33 kPa
B
50.01 kPa
C
46.64 kPa
D
48.33 kPa
Answer: 46.64 kPa
#169.
A certain soil deposit has a Ko = 0.507, a liquid limit of 47%, and a plastic limit of 24%. Compute the total stress at rest lateral earth pressure at a depth of 5 m in the same sand deposit but a
water table is located at a ground surface. The saturated unit weight of sand is \(20.5 kN/m^3\).
A
84.31 kPa
B
80.64 kPa
C
72.21 kPa
D
76.15 kPa
Answer: 76.15 kPa
#170.
Specifications on a job required a fill using borrowed soil to be compacted at 95% of its
standard Proctor maximum dry density. Tests indicate that the maximum is 19.5 kN/m3 with 12% moisture.
The borrow material has a void ratio of 0.60 and a solid specific gravity of 2.65. Compute the dry unit weight of the compacted soil.
A
\(17.216 kN/m^3\)
B
\(15.132 kN/m^3\)
C
\(19.761 kN/m^3\)
D
\(18.525 kN/m^3\)
Answer: \(18.525 kN/m^3\)
#171.
Specifications on a job required a fill using borrowed soil to be compacted at 95% of its
standard Proctor maximum dry density. Tests indicate that the maximum is 19.5 kN/m3 with 12% moisture.
The borrow material has a void ratio of 0.60 and a solid specific gravity of 2.65. Compute the wet unit weight of the compacted soil.
A
\(20.7 kN/m^3\)
B
\(19.6 kN/m^3\)
C
\( 18.5 kN/m^3\)
D
\(21.2 kN/m^3\)
Answer: \(21.2 kN/m^3\)
#172.
Specifications on a job required a fill using borrowed soil to be compacted at 95% of its
standard Proctor maximum dry density. Tests indicate that the maximum is 19.5 kN/m3 with 12% moisture.
The borrow material has a void ratio of 0.60 and a solid specific gravity of 2.65. Find the required minimum volume of borrow soil required to fill one cubic meter.
A
1.14 3
B
1.38 3
C
1.65 3
D
1.29 3
Answer: 1.14 3
#173.
A saturated clay layer has a thickness of 8 m with a water content of 50% and a specific
gravity of 2.78. Compute the saturated unit weight of the clay.
A
\(15.69 kN/m^3\)
B
\(18.37 kN/m^3\)
C
\(20.45 kN/m^3\)
D
\(17.12 kN/m^3\)
Answer: \(17.12 kN/m^3\)
#174.
A saturated clay layer has a thickness of 8 m with a water content of 50% and a specific
gravity of 2.78. Determine the total stress at the bottom.
A
157.44 kPa
B
141.27 kPa
C
147.84 kPa
D
136.96 kPa
Answer: 136.96 kPa
#175.
A saturated clay layer has a thickness of 8 m with a water content of 50% and a specific
gravity of 2.78. Find the effective stress at the bottom.
A
64.19 kPa
B
39.12 kPa
C
46.79 kPa
D
58.48 kPa
Answer: 58.48 kPa
#176.
A dense silt layer has the following properties:
Void ratio e = 0.40
Effective diameter d10 = 10 micrometers
Capillary constant C = 0.20 sq cm
Free ground water level is 8.0 m below the ground surface.
Find the height of the capillary rise in the soil.
A
8 m
B
4 m
C
7 m
D
5 m
Answer: 5 m
#177.
A dense silt layer has the following properties:
Void ratio e = 0.40
Effective diameter d10 = 10 micrometers
Capillary constant C = 0.20 sq cm
Free ground water level is 8.0 m below the ground surface.
Find the vertical effective stress in kPa at 5 m depth. Assume saturated unit weight = 26.5 kN/m^3 and that the soil above
the capillary action rise and ground surface is partially saturated at 50%.
A
177 kPa
B
162 kPa
C
150 kPa
D
134 kPa
Answer: 134 kPa
#178.
A dense silt layer has the following properties:
Void ratio e = 0.40
Effective diameter d10 = 10 micrometers
Capillary constant C = 0.20 sq cm
Free ground water level is 8.0 m below the ground surface.
Find the vertical effective stress at 10 depth. Assume unit weight of saturated soil equal to 26.5 kN/m^3 and capillary action rise and ground surface is partially saturated at 50%.
A
277.55
B
261.18
C
239.46
D
205.29
Answer: 205.29
#179.
This test is described as follows: "The water supply at the inlet is adjusted in such a way that the difference of head between the inlet and the outlet remains constant during the test period."