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The ultimate bearing capacity of a pile is the maximum load which it can carry without failure or excessive settlement of the ground. The bearing capacity also depends on the methods of installation
An 'under-reamed' pile is one with an enlarged base or a bulb; the bulb is called 'under-ream'.
Under-reamed piles are cast-in-situ piles, which may be installed both in sandy and in clayey soils. The ratio of bulb size to the pile shaft size may be 2 to 3; usually a value of 2.5 is used.
As1 = πbL1qs1 = αC α < 1.
As2 = πbuL2qs2 = αC α < 1.
where, bu = dia of bulb, Spacing = 1.5 bu.
Qup = qbAb + qs1As1 + Qs2As2
Negative Skin Friction
The ultimate load carrying capacity of the pile group is finally chosen as the smaller of the
To determine design load or allowable load, apply a suitable factor of safety.