Soil Mechanics and Foundation Sheet 25

1) Question.

If the soil below the base of the footing is dry or moist, the confining pressure is approximately........ the confining pressure available when the water table is at the base of the footing.
Answer.
- 1
  
  equal to
- 2
  
  double
- 3
  
  three times
- 4
  
  four times
Answer: 2

Explanation:
2) Question.

The ultimate bearing capacity per unit area of a soil for general shear failure is

[c= Cohesion value, r= Radius of footing, B= Width of footing, $D_{f}$ = Depth of foundation, $γ$ = Density of soil, and $N_{c}, N_{q}, N_{γ}$ = Bearing capacity factors]
Answer.
- 1
  
  $0.5 γ B N_{γ} + γ D_{f} N_{q}$
- 2
  
  $c N_{c} + 0.5 γ B N_{γ} + γ D_{f} N_{q}$
- 3
  
  $1.3 c N_{c} + γ D_{f} N_{q} + 0.6 γ . r . N_{γ}$
- 4
  
  $1.3 c N_{c} + γ D_{f} N_{q} + 0.4 γ B N_{γ}$
Answer: 2

Explanation:
3) Question.

The ultimate bearing capacity per unit area of sands for general shear failure is given by
Answer.
- 1
  
  $0.5 γ D_{f} N_{q} + γ B N_{γ}$
- 2
  
  $0.5 γ B N_{γ} + γ D_{f} N_{q}$
- 3
  
  $0.67 γ D_{f} N_{γ} + γ B N_{q}$
- 4
  
  $0.67 γ B N_{q} + γ D_{f} N_{γ}$
Answer: 2

Explanation:
4) Question.

The bearing capacity factors $N_{c}, N_{q}, N_{γ}$ are functions of
Answer.
- 1
  
  cohesion of the soil
- 2
  
  friction angle
- 3
  
  internal friction angle
- 4
  
  both (a) and (b)
Answer: 3

Explanation:
5) Question.

The ultimate bearing capacity per unit area of clays for general shear failure is given by
Answer.
- 1
  
  $1.54 c + γ D_{f}$
- 2
  
  $4.15 c + γ D_{f}$
- 3
  
  $c + 1.54 γ D_{f}$
- 4
  
  $5.7 c + γ D_{f}$
Answer: 4

Explanation:
6) Question.

The ultimate net bearing capacity of clays depends upon the value of cohesion.
Answer.
- 1
  
  Agree
- 2
  
  Disagree
Answer: 1

Explanation:
7) Question.

The coefficient of passive earth pressure...... with the increase of angle of shearing resistance.
Answer.
- 1
  
  increases
- 2
  
  decreases
- 3
  
  does not change
Answer: 1

Explanation:
8) Question.

The bearing capacity of a soil....... with the decrease in the area of the footing.
Answer.
- 1
  
  increases
- 2
  
  decreases
- 3
  
  does not change
Answer: 1

Explanation:
9) Question.

The bearing capacity of a soil depends upon
Answer.
- 1
  
  grain size of the soil
- 2
  
  size of the footing
- 3
  
  shape of the footing
- 4
  
  all of these
Answer: 4

Explanation:
10) Question.

The maximum unit pressure that a soil can withstand without rupture in shear or without excessive settlement of the structure, is called
Answer.
- 1
  
  allowable bearing pressure
- 2
  
  safe bearing capacity
- 3
  
  ultimate bearing capacity
- 4
  
  bearing capacity
Answer: 2

Explanation:

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