Soil Mechanics And Foundation Sheet 37

1) Question.

Consider the following statements regarding under-reamed piles:

1. They are used in expansive soils.

2. They are of pre-cast reinforced concrete.

3. The ratio of bulb to shaft diameters is usually 2 to 3.

4. Minimum spacing between the piles should not be less than 1.5 times the bulb diameter.

Of these statements
Answer.
- 1
  
  1, 2 and 3 are correct
- 2
  
  1, 3 and 4 are correct
- 3
  
  2, 3 and 4 are correct
- 4
  
  1, 2 and 4 are correct
Answer: 2

Explanation:
2) Question.

A and B are Skempton's pre pressure coefficients. For saturated normally consolidated soils,
Answer.
- 1
  
  A>1 and B>1
- 2
  
  A>1 and B<1
- 3
  
  A<1 and B>1
- 4
  
  A<1 and B=1
Answer: 4

Explanation:
3) Question.

If s is the shear strength, c and $ϕ$ are shear strength parameters, and $σ_{n}$ is the normal stress at failure, then Coulomb's equation for shear strength of the soil can be represented by
Answer.
- 1
  
  $c = s + σ_{n} \tan ϕ$
- 2
  
  $c = s - σ_{n} \tan ϕ$
- 3
  
  $s = σ_{n} + c \tan ϕ$
- 4
  
  $s = c - σ_{n} \tan ϕ$
Answer: 2

Explanation:
4) Question.

A soil fails under an axial vertical stress of $100 k N / m^{2}$ in uncofined compression test. The failure plane makes an angle of $50 °$ with the horizontal. The shear parameters c and $ϕ$ respectively will be
Answer.
- 1
  
  $41.9 k N / m^{2}, 0 °$
- 2
  
  $50.0 k N / m^{2}, 0 °$
- 3
  
  $41.9 k N / m^{2}, 10 °$
- 4
  
  $50.0 k N / m^{2}, 10 °$
Answer: 4

Explanation:
5) Question.
Which of the following laboratory triaxial test paramenters should one specify to be carried out in connection with the initial stability of footing on saturated clay?
1. Ccu, ϕcu-Consolidated undrained2. Ccu,<
Answer.

1
1 alone

2
2 alone

3
1 and 3

4
1, 2 and 3

Answer: 2

Explanation:

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6) Question.
Consider the following statements in relation to the given sketch:
Answer.
1
1, 2 and 3 are correct

2
1, 3 and 4 are correct

3
2, 3 and 4 are correct

4
1, 2 and 4 are correct
Answer: 2

Explanation:
7) Question.
A deposit of fine sand has a porosity n and specific gravity of soil solids is G. The hydraulic gradient of the deposit to develop boiling condition of sand is given by
Answer.
- 1
  $i_{c = (G - 1) (1 - n)}$
- 2
  
  $i_{c = (G - 1) (1 + n)}$
- 3
  
  $i_{c} = \frac{G - 1}{1 - n}$
- 4
  
  $i_{c} = \frac{G - 1}{1 + n}$
Answer: 1

Explanation:
8) Question.

A concentrated load of 50 t acts vertically at a point on the soil surface. If Boussinesq's equation is applied for computation of stress, then the ratio of vertical stresses at depths of 3 m and 5 m respectively vertically below the point of application of load will be
Answer.
- 1
  
  0.36
- 2
  
  0.60
- 3
  
  1.66
- 4
  
  2.77
Answer: 4

Explanation:
9) Question.

Bearing capacity of a soil strata supporting a footing of size 3 m x 3 m will not be affected by the presence of ground water table located at a depth which is
Answer.
- 1
  
  1.0 m below the base of the footing
- 2
  
  1.5 m below the base of the footing
- 3
  
  2.5 m below the base of the footing
- 4
  
  3 m below the base of the footing
Answer: 4

Explanation:
10) Question.

In Newmark's influence chart for stress distribution, there are ten concentric circles and ten radial lines. The influence factor of the chart is
Answer.
- 1
  
  0.1
- 2
  
  0.01
- 3
  
  0.001
- 4
  
  0.0001
Answer: 2

Explanation:

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$V o l u m e, c m^{3}$		Weight,g
0.2	Air	0
0.3	Water	0.3
0.5

Soil Mechanics and Foundation Sheet 37

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