Learning Objectives:

• Identify different types of shallow foundations, including spread footings, mat foundations, and slab-on-grade foundations.
• Define soil bearing capacity and understand its importance in shallow foundation design.
• Identify factors influencing soil bearing capacity, including soil type, moisture content, density, and strength properties.

Jethrude Hipolito, CC BY-SA 4.0, via Wikimedia Commons

Solved Example: 9077-01

In Terazaghi's theory of bearing capacity of shallow foundation, which of the following zones is assumed to act as if it were part of the following:

A. Zone of linear shear

B. Zone of radial shear

C. Zone of elastic equilibrium

D. Overburden Zone

Correct Answer: C

Solved Example: 9077-02

Two footings, one circular and the other strip, are founded on the surface of a purely Cohesionless soil. Diameter of the circular footing and width of strip footing is same. Then, the ratio of ultimate bearing capacity of circular to strip footing is:

A. 0.75

B. 0.60

C. 1.20

D. 1.33

Correct Answer: B

Solved Example: 9077-03

According to Terzaghi theory, what is the value of coefficient N$_c$for an angle of shear resistance ($\phi$) = 0?

A. 9.14

B. 5.70

C. 5.14

D. 5.50

Correct Answer: B

Solved Example: 9077-04

A square footing for a column carries a total Load (including the self-weight of footing) of 1760 KN. The safe bearing capacity of soil is 200 kN/m². Using M 20 grade concrete and Fe415 steel, the area of footing (rounded to the nearest integer) will be:

A. 9 m$^2$

B. 2 m$^2$

C. 25 m$^2$

D. 16 m$^2$

Correct Answer: A

Solved Example: 9077-05

The gross bearing capacity of a strip footing 1.5 m wide located at a depth of 1.2 m in clay is 420 kN/m$^2$. If the unit weight of the soil is 20 kN/m$^3$, estimate the net bearing capacity in kN/m$^2$ units.

A. 400

B. 390

C. 366

D. 396

Correct Answer: D

Learning Objectives:

• Recognize the difference between shallow and deep foundations and the scenarios in which deep foundations are required.
• Learn about different types of deep foundations, including driven piles, drilled shafts (bored piles), micropiles, and caissons.
• Understand the advantages, limitations, and common applications of each type.

Solved Example: 9076-01

The unit soil pressure or safe bearing pressure is also known as:

A. Net allowable bearing pressure

B. Net safe settlement pressure

C. Net ultimate bearing pressure

D. Gross safe bearing pressure

Correct Answer: B

Solved Example: 9076-02

To determine _______________, the total load is divided by the safe bearing capacity of soil.

A. Depth of foundation

B. Width of foundation

C. Dead load of foundation

D. Soil bearing capacity

Correct Answer: B