Soil Mechanics and Foundation
At liquid limit, all soils possess

different shear strengths of large magnitude
different shear strengths of small magnitude
same shear strength of large magnitude
same shear strength of small magnitude

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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
Stress distribution on the failure plane, is non uniform
Precise measurement of pore pressure and change in volume during test, is not possible
None of these

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