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1.	The depth of foundation is usually calculated from:1). Rankine’s formula2). Netwton’s formula3). De Almbert’s formula4). Gutter’s formula
Answer» Rankine’s formula provides the guidance on the minimum depth of foundation BASED on bearing capacity of the soil. $( q_u={\gamma } {D_{f}}\left( {\frac{{1 - \sin \varphi }}{{1 + \sin \varphi }}} \right)^2)$ Therefore, the depth of the foundation can be expressed as $(D_f = \frac{q_u}{\gamma }\left( {\frac{{1 - \sin \varphi }}{{1 + \sin \varphi }}} \right)^2)$ Where, D_f = minimum depth of foundation, q_u= ultimate bearing capacity of the soil, γ = density of soil, $(\varphi )$ = ANGLE of repose or INTERNAL FRICTION of soil.

The depth of foundation is usually calculated from:1). Rankine’s formula2). Netwton’s formula3). De Almbert’s formula4). Gutter’s formula

Answer»

Rankine’s formula provides the guidance on the minimum depth of foundation BASED on bearing capacity of the soil.

$( q_u={\gamma } {D_{f}}\left( {\frac{{1 - \sin \varphi }}{{1 + \sin \varphi }}} \right)^2)$

Therefore, the depth of the foundation can be expressed as

$(D_f = \frac{q_u}{\gamma }\left( {\frac{{1 - \sin \varphi }}{{1 + \sin \varphi }}} \right)^2)$

Where, D_f = minimum depth of foundation, q_u= ultimate bearing capacity of the soil, γ = density of soil, $(\varphi )$ = ANGLE of repose or INTERNAL FRICTION of soil.

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