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Foundation Engineering

Types of Foundation

For a propose...

Question

For a proposed building, raft foundation, isolated footings and combined footings are being considered. These foundations are to be listed in the decreasing order of preference in terms of performance. Which one of the following is the correct order of listing?

A

Raft foundation - Combined footings -Isolated footings

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B

Isolated footings - Raft foundation -Combined footings

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C

Combined footings - Raft foundation - Isolated footings

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D

Combined footings - Isolated footing - Raft foundation

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Solution

The correct option is A Raft foundation - Combined footings -Isolated footings

Isolated foundation is provided to support an individual column.

Combined footing is used when two columns are so close to each other that their individual footings would overlap each other.

Raft foundation is a large slab supporting a number of columns and walls under the entire structure or a large part of the structure.

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Similar questions

Q. Consider the following statements:
1. According to Terzaghi, a foundation is shallow if its depth is equal to or less than its width.
2. Spread footing, strap footing and raft footing are types of shallow foundations.
3. Combined footing may be trapezoidal if the two columns carry unequal loads; and rectangular if both columns carry equal loads.
4. For water tanks, providing raft foundations will avoid unequal settlements.
Which of the above statements are correct?

Q. Which of the following statements are correct about Terzaghi's theory for shallow foundations ?

1. Terzaghi considered footing to be continuous such as strip footing, which makes analysis two dimensional.

2. Terzaghi considered base of the footing to be smooth and ignore side resistance of the footing.

Q. Consider the following statements
1. The benefit of surcharge and depth of foundation is only marginal in case of footings on purely cohesive soils.
2. The bearing capacity of a footing in pure clay increases with increase in size of the footing.
3. Size effects in plate load tests are more important in case of cohesionless soils.
Which of these statements are correct?

Q. A machine of mass 100 kg is subjected to an external harmonic force with a frequency of 40 rad/s. The designer decides to mount the machine on an isolator to reduce the force transmitted to the foundation. The isolator can be considered as a combination of stiffness(K) and damper(damping factor

ξ

) in parallel. The designer has the following four isolators:Arrange the isolators in the ascending order of the force transmitted to the foundation.

$1 - 3 - 4 - 1$
$1 - 3 - 2 - 4$
$3 - 1 - 2 - 4$
$4 - 3 - 1 - 2$

Q. Consider the following statements:
1. In the case of footings on purely cohesive soils, the benefit due to surcharge or depth of foundation is only marginal.
2. The bearing capacity of a footing in pure clay may be increased by increasing its size.
3. Factor of safety should be applied only to the net ultimate bearing capacity.
which of the above statements are correct ?

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