Soil Mechanics and Foundation
A grillage foundation

Is provided for heavily loaded isolated columns
Is treated as spread foundation
All of these
Consists of two sets of perpendicularly placed steel beams

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

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

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Soil Mechanics and Foundation
In a triaxial compression test when drainage is allowed during the first stage (i. e. application of cell pressure) only and not during the second stage (i.e. application of deviator stress at constant cell pressure), the test is known as

unconsolidated drained test
unconsolidated undrained test
consolidated drained test
consolidated undrained test

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