Which one of the following is the reason for the likelihood of erroneous results of a Direct Shear Test on a saturated clay sample?

The test amounts to undrained test

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Failure plane is predetermined

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Progressive failure might take place

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Drainage conditions are not controllable

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Solution

The correct option is B Failure plane is predetermined
In the case of saturated clay sample, the quick test condition of box shear test will not allow drainage so $Φ = 0$ . It means that the weakest plane will lie at an angle $45 °$ from the horizontal plane. However in this case failure plane is predetermined which is not the weakest plane.

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