Question

Directions: The following items consists of two statements; one labelled as 'Assertion (A}' and the other as 'Reason (R)'. You are to examine these two statements carefully and select the answers to these items using the codes given below:

Assertion (A}: Stress paths can be plotted for stress conditions during triaxial test.
Reason (R): It is not possible to control drainage in a triaxial test.

• A. both A and R are true and R is the correct explanation of A
• B. both A and R are true but R is not a correct explanation of A
• C. A is true but R is false
• D. A is false but R is true

Answer 1

The correct option is C A is true but R is false

The triaxial compression test consists of two stages:

• First stage: In this, a soil sample is set in the triaxial cell and confining pressure is then applied.
• Second stage: In this, additional axial stress also called deviator stress) is applied which induces shear stresses in the sample. The axial stress is continuously increased until the sample fails.

During both the stages, the applied stresses, axial strain, and pore water pressure or change in sample volume can be measured. Drainage can be very much controlled in Triaxial Test.