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Soil Mechanics and Foundation Engineering - Engineering

Q1:

The direct shear test suffers from the following disadvantage:

A Drain condition cannot be controlled

B Pore water pressure cannot be measured

C Shear stress on the failure plane is not uniform.

D The area under the shear and vertical loads does not remain constant throughout the test

E All the above.

ANS:C - Shear stress on the failure plane is not uniform.

Shear stress on the failure plane is not uniform: In some cases, the direct shear test may result in non-uniform shear stress distribution along the failure plane. This can affect the accuracy of shear strength measurements and the interpretation of test results.