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What is Bearing Capacity of Soil? How will you calculate
for a particular type of Soil?
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Answer Posted / harshal.s.khode
Bearing capacity is the power of foundation soil to hold
the forces from the superstructure without undergoing shear
failure or excessive settlement. Foundation soil is that
portion of ground which is subjected to additional stresses
when foundation and superstructure are constructed on the
ground. The following are a few important terminologies
related to bearing capacity of soil.
Ultimate Bearing Capacity (qf) : It is the maximum pressure
that a foundation soil can withstand without undergoing
shear failure.
Net ultimate Bearing Capacity (qn) : It is the maximum
extra pressure (in addition to initial overburden pressure)
that a foundation soil can withstand without undergoing
shear failure.
qn = qf - qo
Here, qo represents the overburden pressure at foundation
level and is equal to үD for level ground without surcharge
where ү is the unit weight of soil and D is the depth to
foundation bottom from Ground Level.
Safe Bearing Capacity (qs) : It is the safe extra load the
foundation soil is subjected to in addition to initial
overburden pressure.
Here. F represents the factor of safety.
Allowable Bearing Pressure (qa) : It is the maximum
pressure the foundation soil is subjected to considering
both shear failure and settlement.
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