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Question

A raft of 6 m×9 m is founded at a depth of 3m in a cohesive soil having c=120kN/m2. The ultimate net bearing capacity of the soil using the Terzaghi's theory will be nearly

A
820kN/m2
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B
920kN/m2
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C
1036kN/m2
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D
1067kN/m2
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Solution

The correct option is A 820kN/m2
(a)
qnet. ult=sc c Nc
where shape factor,

sc=1+0.3B/L

=1+0.3×69=1.2

qnet, ult=1.2×120×5.7

=820.8kN/m2

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