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Soil Mechanics and Foundation Engineering
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The soil which contains finest grain particles, is
silt
coarse sand
fine sand
clay.
When drainage is permitted under initially applied normal stress only and full primarily consolidation is allowed to take place, the test is known as
consolidated undrained test
None of these.
drained test
quick test
Pick up the in-correct statement from the following: The soils which contain montmorillonite minerals
None of these.
shrink more when dry
possess high plasticity
possess high coefficient of internal coefficient
swell more when wet
Darcy's law is applicable to seepage if a soil is
homogeneous
Isotropic
All the above.
incompressible
The earth pressure of a soil at rest, is proportional to (where φ is the angle of internal friction of the soil)
NONE OF THESE
tan (45° - φ)
tan2 (45° + φ)
tan (45° + φ)
tan2 (45° - φ)
For testing a saturated clay for shear strength, the test recommended, is
direct shear test
All the above.
triaxial compression test
unconfined compression test
260 g of wet soil was taken in a pycnometer jar of weight 400 g in order to find the moisture content in the soil, with specific gravity of soil particles 2.75. The weight of soil and remaining water filled in pycnometer without air bubbles was 1415 g and the weight of pycnometer filled with water alone was 1275 g. The moisture content in the soil is
18.2%
53.8%
24.2%
None of these.
Accurate determination of water content, is made by
oven-drying method.
sand bath method
calcium carbide method
alcohol method
Geologic cycle for the formation of soil, is
None of these.
Weathering → transportation → deposition → upheaval
Weathering → upheaval → transportation → deposition
Transportation → upheaval → weathering → deposition
Upheavel → transportation → deposition → weathering
The void ratio of a soil sample decreases from 1.50 to 1.25 when the pressure is increased from 25 tonnes/m2 to 50 tonnes/m2, the coefficient of compressibility is
0.02
0.05
0.001
0.01
Maximum size of clay particles, is
0.08 mm
0.06 mm
0.04 mm
0.002 mm
1 mm
The compressibility of clays, is caused due to
expulsion of double layer water from in between the grains
All the above.
bending of particles as elastic sheets
sliping of particles to new positions of greater density
If the cohesive force,
(c), is 1.5 t/m2, the density (γ) of the soil is 2.0 t/m3, factor of safety (F) is 1.5 and stability factor (Sn) is 0.05, the safe height of the Â§lope, is
12 metres
5 metres
8 metres
10 metres
Back fill with a sloping surface exerts a total active pressure Pa on the wall of height H and acts at
H/4 above the base parallel to base
H/3 above the base parallel to base
H/2 above the base parallel to base
H/5 above the base parallel to base.
The shear strength of a soil
is proportional to the cohesion of the soil
increases with an increase in the normal stress
is generally known as the strength of the soil
is proportional to the tangent of the angle of internal friction
All the above.
The active earth pressure of a soil is proportional to (where φ is the angle of friction of the soil)
tan2 (45° - φ/2)
tan (45° + φ)
tan (45° - φ)
tan2 (45° + φ/2)
A pile is being driven with a drop hammer weighing 1800 kg and having a free fall of 1.00 m. If the penetration with last blow is 5 mm, the load carrying capacity of the pile, -according to the Engineering News formula, is
50 tonnes
10 tonnes.
20 tonnes
100 tonnes
A compacted soil sample using 10% moisture content has a weight of 200 g and mass unit weight of 2.0 g/cm3.
If the specific gravity of soil particles and water are 2.7 and 1.0, the degree of saturation of the soil is
69.6%
55.6%
None of these.
11.1%
In a liquid limit test, the moisture content at 10 blows was 70% and that at 100 blows was 20%. The liquid limit of the soil, is
50%
35%
65%
None of these.
Failure of the stability of slopes, generally occurs along
a horizontal surface
slip plane
all the surfaces.
a curved surface
1
2
6
11
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