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Question

A column is supported on a footing as shown in the figure below. The water table is at a depth of 10 m below the base of the footing.

The net ultimate bearing capacity (kN/m2) of the footing based on Terzaghi's bearing capacity equation is

A
216
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B
432
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C
630
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D
876
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Solution

The correct option is C 630
Size of footing,
=1.5 m × 3 m
Depth of footing, Df = 1 m
γ = 18 kN/ m3
Nq = 24
C = 0
Water table is at a depth of 10 m (>1.5m) below the base of footing so it will not affect the bearing capacity.
Net ultimate bearing capacity for rectangular footing

qnu=(1+0.3BL) CNc+q(Nq1)+(10.2BL)(12BγNγ)

=18×1×23+(10.2×1.53)×(12×1.5×18×20

=657kN/m2
Here, near by answer is option (c).


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