A 1 m square footing is founded at a depth of 1.80 m on sand (foundation base thickness is 80 cm) and carries a vertical column load of 150 kN. The underlying sand has drained shear strength parameters of φ’=28°. First, compute the allowable shear load this column can carry using ASD with a sliding factor of safety of 1.1. Next, compute the allowable shear load for the case shear resistance using active and passive earth pressures and without them.

Fundamentals of Geotechnical Engineering (MindTap Course List)
5th Edition
ISBN:9781305635180
Author:Braja M. Das, Nagaratnam Sivakugan
Publisher:Braja M. Das, Nagaratnam Sivakugan
Chapter16: Shallow Foundations-bearing Capacity
Section: Chapter Questions
Problem 16.19CTP: A 2.0 m 2.0 m square pad footing will be placed in a normally consolidated clay soil to carry a...
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A 1 m square footing is founded at a depth of 1.80 m on sand (foundation base thickness is 80
cm) and carries a vertical column load of 150 kN. The underlying sand has drained shear strength
parameters of φ’=28°. First, compute the allowable shear load this column can carry using ASD
with a sliding factor of safety of 1.1. Next, compute the allowable shear load for the case shear
resistance using active and passive earth pressures and without them. 

Expert Solution
Step 1

Given data:

Area of footing=1m2

Depth of footing=1.8m

Depth of foundation=0.8 m

Column load=150 kN

Shear strength parameter, ϕ'=28°

Factor of safety=1.1

It is asked to compute the allowable shear load

1. Using ASD method

2. Active and passive earth pressure

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