CameraIcon

SearchIcon

MyQuestionIcon

2

You visited us 2 times! Enjoying our articles? Unlock Full Access!

Foundation Engineering

Dynamic Method

A timber pile...

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

No worries! We‘ve got your back. Try BYJU‘S free classes today!

B

160 kN

Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses

C

180 kN

No worries! We‘ve got your back. Try BYJU‘S free classes today!

D

200 kN

No worries! We‘ve got your back. Try BYJU‘S free classes today!

Open in App

Solution

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,

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

$= \frac{25 \times 120}{6 (0.6 + 2.5)} = 161.3 k N ≃ 160 k N$

Suggest Corrections

thumbs-up

1

Similar questions

Q. A drop hammer is used to drive a wooden pile. The hammer weight is 25 kN and its free falling height is 0.8 m. The penetration in the last blow is 12 mm. What is the nearest approximation to the load carrying capacity of the pile according to the Engineering News Formula?

Q. A timber pile of length 8m and diameter of 0.2m is driven with a 20 kN drop hammer, falling freely from a height of 1.5m. The total penetration of the Pile in the last 5 blows is 40mm. 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

Q. Skin friction capacities of a 40 cm diameter driven concrete pile for the portions A, B and C are 17 kN, 63 kN and 503 kN respectively, and point load capacity is

11000 k N / m^{2}

. Total pile load capacity will be

Q. A single pile, 50 cm in diameter and 16 m long, in driven in clay having an average unconfined compressive strength of 100 kN/m

^{2}

. The ultimate load carrying capacity of the pile, neglecting end bearing if any, and assuming shear mobilization of 0.75 around the pile, is nearly:

Q. A 450 mm wide, square in section concrete pile, 15 m long , is driven in a deep deposit of uniform clay. Laboratory unconfined compression tests on undisturbed samples indicate an average

q_{u}

k N / m^{2}

. The ultimate load carrying capacity of the pile is ?

(α = 0.8)

.

View More

Join BYJU'S Learning Program

similar_icon

Related Videos

lock

Dynamic Method

FOUNDATION ENGINEERING

Watch in App

explore_more_icon

Explore more

Other Foundation Engineering

Join BYJU'S Learning Program

CrossIcon