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Question

A strip footing having 1.5m width founded at a depth of 3 m below ground level in a clay soil having c=20kN/m2, ϕ=0 and unit weight γ=20kN/m3 What is the net ultimate bearing capcity using Skempton's analysis ?

A
30kN/m2
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B
60kN/m2
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C
100kN/m2
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D
140kN/m2
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Solution

The correct option is D 140kN/m2
(d) Net ultimate bearing capcacity,
qnu=c Nc

Nc=5(1+0.2Df/b)

For strip footing

=5(1+0.2×3/1.5)=7

qnu=20×7=140kN/m2

For square footing or circular footing,

Nc=6(1+0.2Df/b)

For rectangular footing,
Nc=5(1+0.2Df/b)(1+0.2b/L)

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