GATE Civil Engineering (CE) 2019 Shift 2 Solved Paper

Question : 63 of 65

Marks: +1, -0

A timber pile of length

8 {m}

and diameter of

0.2 {m}

is driven with a

20 {kN}

drop hammer, falling freely from a height of

1.5 {m}

. The total penetration of the pile in the last 5 blows is 40

{mm}

. Use the engineering news record expression. Assume a factor of safety of 6 and empirical factor (allowing reducing in the theoretical set, due to energy losses) of

2.5 {cm}

. The safe load carrying capacity of the pile (in

{kN}

, round off to 2 decimal places) is _____________

Your Answer:

Validate

Solution:

Engineering news record expression

{Q}_{ {u}}=(\;{ {wh}}/{ {s}+ {c}})

{s}=

Penetration of pile per hammer blow.

=\;{40 {mm}}/{8}=8 {mm}=0.008 {m}

{C}=2.5 {cm}=0.025 {m}

so,

{Q}_{ {u}}=\;{20 × 1.5}/{(0.025+0.008)}=909.09 {kN}

then safe load carrying capacity

=\;{909.09}/{6}=151.515 {kN}

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