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Question

The ultimate bearing capacity of a soil is 300 kN/m2. The depth of foundation is 1 m and unit weight of soil is 20 kN/m3. Choosing a factor of safety of 2.5, the net safe bearing capacity is

A
100 kN/m2
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B
112 kN/m3
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C
80 kN/m3
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D
100.5 kN/m3
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Solution

The correct option is B 112 kN/m3

γ=20 kN/m3
FOS = 2.5
qu=300 kN/m2

Net safe bearing capacity

qns=qnuFOS=quγDfFOS

=30020×12.5=112 kN/m2

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