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Foundation Engineering

Underreamed Piles

In under-ream...

Question

In under-reamed pile construction, the ratio of shaft diameter to bulb diameter is

A

1/1.5

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B

1/2

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C

1/2.5

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D

1/4

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Solution

The correct option is C 1/2.5
Under reamed piles are bored cast-in-situ concrete piles having one or more number of bulbs formed by enlarging the pile stem. These piles are best suited in soils where considerable ground movements occur due to seasonal veriations, filled up grounds or in soft soil strata

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Similar questions

Q. A singly-reamed,

8 m

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350 mm

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, adhesion factor is 0.3, and the applicable bearing capacity factor is 9) to counteract the impact of soil swelling on a structure constructed above. Neglecting suction and the contribution of the under-ream to the adhesive shaft capacity, what would be the estimated ultimate tensile capacity (rounded off to the nearest integer value in

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Q. A single under-reamed pile is to be installed in a hard clay deposit. The undrained strength obtained from a series of vane tests at different depths have shown linear relationship,

C_{u} = 75 + 5 D i n k N / m^{2}

, where 'D' is the depth in metres. The dia of pile shaft and the bulb are 1.5 m & 3 m respectively. The centre of under-ream is located at 10 m from ground surface. The allowable load on the pile to ensure an overall factor of safety 2.5.

(g i v e n α = 0.4)

(Neglect resistance offered by shaft beneath bulb)

Q. Consider the following statements about the under-reamed pile in swelling soils:Which of these statements are correct?

1, 2 and 3
1 and 2 only
2 and 3 only
1 and 3 only

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