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Question

When a load test was conducted by putting a 60 cm square plate on top of a sandy deposit, the ultimate bearing capacity was observed as 60kN/m2. What is the ultimate bearing capacity for a strip footing of 1.2 m width to be placed on the surface of the same soil?

A
75kN/m2
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B
120kN./m2
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C
150kN/m2
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D
160kN/m2
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Solution

The correct option is C 150kN/m2
According to Terzaghi,
qnu=0.5γBNγ

For strip footing
=0.4γBNγ

For square footing

Using the above equations,

γNγ=600.4×0.6=250kN/m3

For strip footing,

qnu=0.5×1.2×250=150kN/m2

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