GATE CE concept:pile-group-efficiency PYQs & Answers

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concept:pile-group-efficiency

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Information related to foundation design is provided in table below.

Column 1 | Column 2 (I) Converse-Labare formula | (P) Pile capacity from dynamic formula (II) Hiley formula | (Q) Pile group efficiency (III) Newmark’s influence chart | (R) Bearing capacity factor of saturated clay (IV) Skempton’s equation | (S) Increase in vertical stress below footing

Option giving the CORRECT match between Column 1 and Column 2 is:

Your answerChoose one option.

(I) – (Q) ; (II) – (P) ; (III) – (S) ; (IV) – (R)

(I) – (R) ; (II) – (S) ; (III) – (Q) ; (IV) – (P)

(I) – (P) ; (II) – (Q) ; (III) – (S) ; (IV) – (R)

(I) – (R) ; (II) – (S) ; (III) – (P) ; (IV) – (Q)

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A group of 9 friction piles are arranged in a square grid maintaining equal spacing in all directions. Each pile is of diameter 300 mm and length 7 m. Assume that the soil is cohesionless with effective friction angle of

. What is the center-to-center spacing of the piles (in m) for the pile group efficiency of 60%?

Your answerChoose one option.

0.582

0.486

0.391

0.677

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A group of total 16 piles are arranged in a square grid format. The center-to-center spacing (

) between adjacent piles is 3 m. The diameter (

) and length of embedment of each pile are 1 m and 20 m, respectively. The design capacity of each pile is 1000 kN in the vertical downward direction. The pile group efficiency (

) is given by

where

and

are number of rows and columns in the plan grid of pile arrangement, and

. The design value of the pile group capacity (in kN) in the vertical downward direction is __________________. (round off to the nearest integer)

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GATE CE concept:pile-group-efficiency PYQs

How to practice concept:pile-group-efficiency

Question 22

Question 17

Question 54