A 25 m deep bored pile has a shaft of 1 m diameter and enlarged base of 2.5 m diameter in the lower 1.5 m depth. The undrained cohesion of the soil varies from 100 kPa at the top to 150 kPa at the base. Determine the safe compression load and the allowable pullout resistance (F.S.-2.5, Ysoll -18 kN/m' and Yoone = 23 kN/m². ).

A 25 m deep bored pile has a shaft of 1 m diameter and enlarged base of 2.5 m diameter in the lower 1.5 m depth. The undrained cohesion of the soil varies from 100 kPa at the top to 150 kPa at the base. Determine the safe compression load and the allowable pullout resistance (F.S.-2.5, Ysoll -18 kN/m' and Yoone = 23 kN/m². ).

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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Concept explainers

Braced cuts

The braced cut is a method of providing lateral support to the soil in foundation trenches, to prevent the trenches from deformation by the caving in of soil and resisting it from moving laterally. During shallow excavation in firm soil, generally, slopes are provided to resist the caving in of soil. During shallow excavation in soft soil and deep excavation, the chances of caving in of soil increase. Hence, it becomes necessary to make a provision to resist the deformation of trenches due to caving in of soil. The braced cut is the method used for such conditions. The excavation using braced cuts is a bit uneconomical as compared to the traditional open-cut excavation method but provides better safety than the cut excavation method.

Question

A 25 m deep bored pile has a shaft of 1 m diameter and enlarged base of 2.5 m diameter in
the lower 1.5 m depth. The undrained cohesion of the soil varies from 100 kPa at the top to
150 kPa at the base. Determine the safe compression load and the allowable pullout
resistance (F.S. -2.5, Ysoil 18 kN/m² and Yoonc =23 kN/m². ).
Quartion 3

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A 40 cm diameter concrete pile, is driven to a depth of 15 m in a deep deposit of clay having unconfined compressive strength of 80 kN/m². The design load carrying capacity of pile will be [Assume α = 0.8 and FOS = 3] - (a) 648.42 kN (c) 432.28 KN ;) (b) 216.14 kN (d) 1296.84 kN
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Please answer 10.4
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