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Question

The net ultimate bearing capacity of a purely cohesive soil

A
depends on the width of the footing and is independent of the depth of the footing
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B
depends on the width as well as the depth of the footing
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C
depends on the depth, but is independent of the width, of the footing
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D
is independent of both the width and the depth of the footing
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Solution

The correct option is D is independent of both the width and the depth of the footing
(d) As per Terzaghi's bearing capacity equation,
qult=cNc+γDfNq+0.5γBNγ

For a purely cohensive soil Nq=1 and Nγ=0

qult=cNc+γDf

But qnet.ult=qultγDf

qnet.ult=cNc+γDfγDf

qnet,ult=cNc

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