(a) A 500 mm diameter bored pile is to be designed to support a safe vertical load of25P kN. Where P = 8. The factor of safety is 2.5 and it is to be applied to the ultimateload. The succession of strata is 2 m of loose fill overlying firm, becoming stiff claywith depth. No side friction is to be allowed in the fill. For the clay the undrainedcohesion cu (kPa) = 3z+40, where z is the depth in metres below ground level.%3DCalculate the minimum length of the pile required to support the load. Take a = 0.4,and Nc = 9.%3D(b) A pile weighing 8P kN has been proposed to be driven down into three layers ofdifferent materials as shown in Figure Q2, to support a structural load from aproposed building project. Where P = 8. Calculate the number of piles needed tosupport an ultimate structural load of Qu MN. Where Qu is the last two digits of yourstudents' identification number (SID). For pile in cohesionless soil, assume o = 4'.

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Answered: minimum length of the pile

Engineering

Civil Engineering

minimum length of the pile

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

Pricing Excavation and Backfill

Backfill, in construction, is the activity of returning the soil and gravel that are removed during building construction or using them again to toughen and support the foundation of the building or any other structural component.

Question

(a) A 500 mm diameter bored pile is to be designed to support a safe vertical load of
25P kN. Where P = 8. The factor of safety is 2.5 and it is to be applied to the ultimate
load. The succession of strata is 2 m of loose fill overlying firm, becoming stiff clay
with depth. No side friction is to be allowed in the fill. For the clay the undrained
cohesion cu (kPa) = 3z+40, where z is the depth in metres below ground level.
%3D
Calculate the minimum length of the pile required to support the load. Take a = 0.4,
and Nc = 9.
%3D
(b) A pile weighing 8P kN has been proposed to be driven down into three layers of
different materials as shown in Figure Q2, to support a structural load from a
proposed building project. Where P = 8. Calculate the number of piles needed to
support an ultimate structural load of Qu MN. Where Qu is the last two digits of your
students' identification number (SID). For pile in cohesionless soil, assume o = 4'.

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Verticle load is 258 kN as opposed to 25*8kN - Apologies

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