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This mock test of Test: Pile Foundation for Civil Engineering (CE) helps you for every Civil Engineering (CE) entrance exam.
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QUESTION: 1

Consider the following statements about the under-reamed pile in swelling soils:

1. Its bulb provides anchor against movement due to volume changes of soil.

2. It is a driven pile.

3. Its bulb diameter is 2.5 times its shaft diameter.

Which of these statements are correct?

Solution:

Under-reamed pile is a special type of bored pile which is provided with a bulb/pedestal at the end. The usual size of such piles are 150 to 200 mm shaft diameter, 3 to 4 m long. The diameter of under-reamed portion is usually 2 to 3 times the shaft diameter.

QUESTION: 2

Consider the following statements:

1. Piles are provided in groups, which are connected together by a pile cap. The structure rests on top of the pile cap. The pile cap is situated below the ground level.

2. For situations where pile is subjected to upward pull, pedestal piles or under reamed piles are more suitable type of foundations.

Which of these statements is/are correct?

Solution:

QUESTION: 3

A square pile of section 30 cm x 30 cm and length 10 m penetrates a deposit of clay having c = 5 kN/m^{2} and the mobilizing factor α = 0.8. What is the load carried by the pile by skin friction only?

Solution:

The load carried by skin-friction only

QUESTION: 4

In the Engineering News Record formula for determining the safe load, carrying capacity of a pile, the factor of safety used is

Solution:

QUESTION: 5

Pile driven in deep clay deposits transfers its loads by

Solution:

For clay deposits ultimate load of pile is given by,

cN_{c}A_{p} accounts for end bearing while accounts for frictional resistance.

QUESTION: 6

Multi-under-reamed piles are generally provided in

Solution:

QUESTION: 7

Resistance load due to skin friction for a pile varies with

Solution:

Resistance load due to skin friction A_{s} is surface area of pile over which skin friction acts = π D x L = πLD

QUESTION: 8

Immediately on driving a pile in clayey soil, it will have

Solution:

QUESTION: 9

In pile foundation, the skin friction and end bearing are separated by

Solution:

Static formula gives the ultimate capacity of an individual pile

Hileys formula and Engineering news formula are dynamic formula to calculate the load-carrying capacity of a driven pile

In Cyclic loading test an incremental load is repeatedly applied and removed to separate skin friction and end bearing of a pile.

QUESTION: 10

The settlement ratio of pile group is generally

Solution:

The settlement of a group of piles in more than the settlement of a single pile even when the load on the single pile and the load on each pile of the pile group are same. This is because of the fact that the zone of influence of a pile group is much deeper than that of a single pile.

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