Soil Mechanics and Foundation
Allowable bearing pressure for a foundation depends upon

allowable settlement only
both allowable settlement and ultimate bearing capacity
ultimate bearing capacity of soil only
none of above

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Soil Mechanics and Foundation
A tri-axial shear test is preferred to direct shear test, because

It can be performed under all three drainage conditions with complete control
Precise measurement of pore pressure and change in volume during test, is not possible
None of these
Stress distribution on the failure plane, is non uniform

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