#180.
It is a device by which a 60o cone that is used to allow independent determination of the cone
resistance and frictional resistance of the soil above the ground.
A
Sand cone
B
Pyncnometer
C
Rubber balloon
D
Penetrometer
Answer: Penetrometer
#181.
These are pushed or driven into the soil that can be used in permeability tests.
A
Head pump
B
Pump well
C
Permeameter
D
Porous probes
Answer: Porous probes
#182.
A sample of sand above the water table was found to have a natural moisture content of 15%
and a unit weight of 120 pcf. Laboratory tests on a dried sample indicated values of \(e_{min} = 0.50\) and
\(e_{max} = 0.85\) for the densest and loosest states respectively.
Find the void ratio.
A
0.788
B
0.645
C
0.587
D
0.609
Answer: 0.587
#183.
A sample of sand above the water table was found to have a natural moisture content of 15%
and a unit weight of 120 pcf. Laboratory tests on a dried sample indicated values of \(e_{min} = 0.50\) and
\(e_{max} = 0.85\) for the densest and loosest states respectively.
Find the degree of saturation.
A
81.5
B
77.6
C
67.7
D
70.4
Answer: 67.7
#184.
A sample of sand above the water table was found to have a natural moisture content of 15%
and a unit weight of 120 pcf. Laboratory tests on a dried sample indicated values of \(e_{min} = 0.50\) and
\(e_{max} = 0.85\) for the densest and loosest states respectively.
Find the density index.
A
0.50
B
1.00
C
0.60
D
0.75
Answer: 0.75
#185.
For a normally consolidated clay, it has an angle of friction of 25o. In a drained triaxial test, the specimen failed at a deviator stress of 180 kPa. Compute the chamber confining pressure.
A
176.54 kPa
B
122.96 kPa
C
186.17 kPa
D
144.66 kPa
Answer: 176.54 kPa
#186.
For a normally consolidated clay, it has an angle of friction of 25o. In a drained triaxial test, the specimen failed at a deviator stress of 180 kPa. Compute the max. stress of failure.
A
318.39 kPa
B
312.47 kPa
C
296.96 kPa
D
302.96 kPa
Answer: 302.96 kPa
#187.
For a normally consolidated clay, it has an angle of friction of 25o. In a drained triaxial test, the specimen failed at a deviator stress of 180 kPa. Compute the shear stress at failure.
A
88.79 kPa
B
80.16 kPa
C
85.29 kPa
D
81.57 kPa
Answer: 81.57 kPa
#188.
Two footings rest in a layer of sand 2.7 m thick. The bottom of the footings are 0.90 m
below the ground surface. Beneath the sand, layer is a 1.8 m clay layer. Beneath the clay layer is a hardpan. The water table is at a depth of 1.8 m below the ground surface.
Compute the stress increase at the center of the clay layer assume that the pressure beneath the footing
is spread at an angle of 2 vertical to 1 horizontal.
A
36.55 kPa
B
21.18 kPa
C
30.18 kPa
D
25.51 kPa
Answer: 25.51 kPa
#189.
Two footings rest in a layer of sand 2.7 m thick. The bottom of the footings are 0.90 m
below the ground surface. Beneath the sand, layer is a 1.8 m clay layer. Beneath the clay layer is a hardpan. The water table is at a depth of 1.8 m below the ground surface.
Determine the size of footing B so that the settlement in the clay layer is the same beneath footings A
and B. Footing A is 1.5 m square.
A
4.77 m
B
3.78 m
C
4.18 m
D
3.24 m
Answer: 3.24 m
#190.
Two footings rest in a layer of sand 2.7 m thick. The bottom of the footings are 0.90 m
below the ground surface. Beneath the sand, layer is a 1.8 m clay layer. Beneath the clay layer is a hardpan. The water table is at a depth of 1.8 m below the ground surface.
Determine the settlement beneath footing A.
A
56.75 mm
B
54.18 mm
C
82.11 mm
D
46.65 mm
Answer: 46.65 mm
#191.
A concrete pile having a diameter of 0.30 m is to be driven into a loose sand having a unit
weight of 20 kN/ cu m. The pile has a length of 12 m. The coefficient of friction between the sand and pile
is 0.4. Bearing capacity factor Nq = 80. The shaft lateral pressure factor K is equal to 0.90. The allowable
load of the pile is 170 kN.
Compute the ultimate bearing capacity of the pile.
A
339.3 kN
B
315.6 kN
C
345.9 kN
D
321.2 kN
Answer: 339.3 kN
#192.
A concrete pile having a diameter of 0.30 m is to be driven into a loose sand having a unit
weight of 20 kN/ cu m. The pile has a length of 12 m. The coefficient of friction between the sand and pile
is 0.4. Bearing capacity factor Nq = 80. The shaft lateral pressure factor K is equal to 0.90. The allowable
load of the pile is 170 kN.
Compute the ultimate frictional capacity.
A
211.7
B
220
C
216.8
D
213.8
Answer: 213.8
#193.
A concrete pile having a diameter of 0.30 m is to be driven into a loose sand having a unit
weight of 20 kN/ cu m. The pile has a length of 12 m. The coefficient of friction between the sand and pile
is 0.4. Bearing capacity factor Nq = 80. The shaft lateral pressure factor K is equal to 0.90. The allowable
load of the pile is 170 kN.
Find the factor of safety.
A
4.79
B
4.02
C
3.11
D
3.25
Answer: 3.25
#194.
A retaining wall 7 m high is supporting a horizontal backfill having a dry unit weight of \(1570 kg/m^3\). The cohesionless soil has an angle of friction of 34° and a void ratio of 0.68. Compute the Rankine active force on the wall.
A
106.77 kN
B
101.53 kN
C
110.65 kN
D
113.87 kN
Answer: 106.77 kN
#195.
A retaining wall 7 m high is supporting a horizontal backfill having a dry unit weight of \(1570 kg/m^3\). The cohesionless soil has an angle of friction of 34° and a void ratio of 0.68. Compute the Rankine active force on the wall if water logging occurs at a depth of 3 m from the ground
surface.
A
153 kN
B
184 kN
C
172 kN
D
166 kN
Answer: 172 kN
#196.
A retaining wall 7 m high is supporting a horizontal backfill having a dry unit weight of \(1570 kg/m^3\). The cohesionless soil has an angle of friction of 34° and a void ratio of 0.68. Compute the location of the resultant active force from the bottom.
A
2.18 m
B
2.02 m
C
1.88 m
D
1.95 m
Answer: 1.95 m
#197.
A cantilever sheet pile is 8.2 m long with a depth of embedment of 3.2 m. The angle of friction
of the soil supported by the sheet pile is 34o and has a unit weight of 1.91 g/cc. There is a water table
below the base of the sheet pile. Use \(9.81 kN/m^3\) as the unit weight of water. Compute the active force acting on the sheet pile.
A
178.3 kN/m
B
164.7 kN/m
C
155.8 kN/m
D
181.2 kN/m
Answer: 178.3 kN
#198.
A cantilever sheet pile is 8.2 m long with a depth of embedment of 3.2 m. The angle of friction
of the soil supported by the sheet pile is 34o and has a unit weight of 1.91 g/cc. There is a water table
below the base of the sheet pile. Use \(9.81 kN/m^3\) as the unit weight of water. Compute the passive force acting on the sheet pile.
A
350.8 kN/m
B
338.7 kN/m
C
326.9 kN/m
D
373.6 kN/m
Answer: 338.7 kN/m
#199.
A cantilever sheet pile is 8.2 m long with a depth of embedment of 3.2 m. The angle of friction
of the soil supported by the sheet pile is 34o and has a unit weight of 1.91 g/cc. There is a water table
below the base of the sheet pile. Use \(9.81 kN/m^3\) as the unit weight of water. Compute the theoretical passive force that must be mobilized to ensure stability.