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Gross SBC means, adding additional soil bearing capacity with net bearing capacity. This additional bearing capacity density of filling material above the footing. For example Net SBC=10T/sqm,
Depth of foundation 1.5m.
Refilling soil density 18KN/Cum.
Gross SBC=100+1.5x18=127KN/Sqm or 12.7T/Sqm at 1.5m depth.
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