Question

A timber pile is being driven with a drop hammer weighing 25 kN and having a free fall of 1.2 m. The average penetration of the pile is 6 mm. What will be the load carrying capacity of pile using the Engineering News Formula ?

• A. 140 kN
• B. 160 kN
• C. 180 kN
• D. 200 kN

Answer 1

The correct option is B 160 kN

Given,
W = 25 kN, H = 1.2 m = 120 cm

Average penetration,
S = 6mm = 0.6 cm

For drop hammer, C = 2.5 cm

As per Engineering News Formula,

$Q=\frac{WH}{6(S+C)}$

$=\frac{25\times 120}{6(0.6+2.5)}=161.3kN\simeq 160kN$