The minimum depth of foundation for a soil
can be calculated using the following formulla as suggested by rankine.
D = minimum depth of foundation in meter
q = intensity of load or safe bearing capacity of soil or total building load in kn/ m square
g = density or unite weight of soil in kn/m cube
Q = angle of repose in degree (internal frictional angle of soil)
Example: calculate the minimum depth required for a foundation to transmit a pressure 58 kn/m square in a cohesionless soil having density 16 kn/m cube and angle of repose 20°.
Ans:-
Given data
Intensity of pressure q = 58 kn/m square
Density of soil = 16 kn/m cube
Angle of repose = 20°
Rankine formula
can be calculated using the following formulla as suggested by rankine.
D = minimum depth of foundation in meter
q = intensity of load or safe bearing capacity of soil or total building load in kn/ m square
g = density or unite weight of soil in kn/m cube
Q = angle of repose in degree (internal frictional angle of soil)
Example: calculate the minimum depth required for a foundation to transmit a pressure 58 kn/m square in a cohesionless soil having density 16 kn/m cube and angle of repose 20°.
Ans:-
Given data
Intensity of pressure q = 58 kn/m square
Density of soil = 16 kn/m cube
Angle of repose = 20°
Rankine formula
D = 58/16×(1-sin20°/1+sin20°)square
= 0.871 m
Note:- according to is-456 2000 minimum depth of foundation should be 1m for any building or house is safe zone.
Video link
https://youtu.be/-GL88CG37_A
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