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eposit of medium sand with φ= 35° and ϒ = 19kn/m3. The water table lies at 2.0 m below ground level. Estimate the

Principles of Foundation Engineering (MindTap Course List)

9th Edition

ISBN:9781337705028

Author:Braja M. Das, Nagaratnam Sivakugan

Publisher:Braja M. Das, Nagaratnam Sivakugan

Chapter12: Pile Foundations

Section: Chapter Questions

Problem 12.10P

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Concept explainers

Calculation of Settlement

The vertical displacement of the structural foundation due to the loading from the superstructure is known as settlement. It is due to the reduction of air voids present in the soil. The amount of vertical displacement depends on the bearing capacity of the soil on which the foundation is laid. The effect of the settlement depends on the magnitude of settlement, uniformity, and the structural design of the structure. The maximum allowable settlement for residential and office buildings should be less than 18 mm, for industrial buildings, it is 38 mm and for commercial buildings, it is 25 mm.

Question

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A concrete pile, 350 mm square, is driven into a thick deposit of medium sand with φ= 35° and ϒ = 19kn/m3. The water table lies at 2.0 m below ground level. Estimate the length of pile required to support a working load of 450 KN assuming a an overall factor of safety of 2.5.

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