Question

1. Bearing capacity of strip foundation is independent of water table location (True/False)

2. Density of sand significantly affects the bearing capacity factor Nq (True/False)

3. The bearing capacity of square footing (Length x Width = 39 x 39 m) is higher than strip footing (Width 39 m) under similar conditions (True/False)

4. Bending moment of 39 kNm increases the ultimate bearing capacity of strip footing having a width of 39 m (True/False)

5. Shape factors for square footing with inclined loading should always be set to 1.0 (True/False)

Answer 1

1:- False-

The position of ground water has a significant effect on the bearing capacity of soil. As it rise bearing capacity decreases and as it falls bearing capacity increase.

2:- True-

There mainly three factor Nc, Nq, Nγ. Density index is affected by these factors and serves as a parameter to correlate properties of soils.

3:- False:-

If width is same for both sqaure footing and strip footing then the bearing capacity of square footing will be less.

4:- False-

If there is bending moment then soil must be loose so that its bearing capacity decreases not increases.For the given condition the moment is 39 KN and width is also 39 m then load will be 1 KN so that when calculating bearing capacity the it decreases.

5:- False-

Terzaghi (1943) proposed the shape factors sc=1.3, sq=1, sγ =0.8, and sc=1.3, sq=1, sγ=0.6 for square and circular footing, respectively. So it is not always 1.0.

Thank you.