Building Construction
According to Rankine's formula, minimum depth of foundations, is

(P/w) × [(1 - sin φ)/(1 + sin φ)]²
(P/2w) × [(1 - sin φ)/(1 + sin φ)]²
(P/w) × [(1 + sin φ)/(1 - sin φ)]²
(P/w) × [(1 + sin φ)/(1 - sin φ)]

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