Soils

Question 1

Minimum Safety Factor against Rotational Failure of footings

Answer 1

1.3

Question 2

When water table raises to ground surface the ultimate bearing capacity of the soil will?
A) Increase
B) Decrease
C) stay

Answer 2

Decrease

Question 3

Bearing capacity of the soil refers to:

Answer 3

Capacity of soil to support a foundation

Question 4

Relationship between Janbu and Taylor’s stability number

Answer 4

(Janbu) No = 1/ Ns (Tylor)

Question 5

Assumptions for Method of Slices

Answer 5

• Side forces on slides neglected
• Slices can be irregular
• Forces and Moments balanced at failure point

Question 6

General Shear failure on ____soil
_____ bulging and ______

Answer 6

• Happens on dense, stiff soil
• Continuous bulging and tilting
  -Dense sands and Stiff Clays

Question 7

Local Shear on ____ Soil
____ Settlement
____ Bulging

Answer 7

Happens on loose, soft soil
- Not sudden and no tilting
- considerable settlement
- Slight bulging around footing
- Sands or clays of medium compaction

Question 8

Punching shear failure in ____ Soil.
____ Bulging
____ Settlement

Answer 8

Fairly loose Soil with very high compressibility
- No bulging
- very large settlement

Question 9

Thrust =

Answer 9

Force! (Lb/lf)

Question 10

If water table fluctuates but remains below ground surface, effective stress below water table:

Answer 10

Remains constant

Question 11

Due to load, elastic settlement of ground is caused by:

Answer 11

Deformation of soil
No change in Water content

• reversible, temporary process
  -Opposed to consolidation (water changes)