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For assessing the long-term stability of a slope in stiff fissured clay which type of the following laboratory test has to be done
1. Undrained triaxial test
2. Drained triaxial test
3. Consolidated undrained test
4. Quick vane shear test

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Correct Answer - Option 2 : Drained triaxial test

Explanation:

Types of Triaxial test on the basis of Drainage:

1. Unconsolidated Undrained test (UU test):

(i) It is quick test and may complete in 5-10 minutes.

(ii) In this test water is not allowed to leave the soil either during the consolidation stage (confining stage) nor shear stage (deviator stage).

(iii) Such tests are suitable for low permeable soil such as clays with fast loading.

(iv) UU test is carried out for evaluation of short-term stability of the structure.

2. Consolidated Undrained Test (CU test):

(i) During the first stage of confining pressure, drainage is allowed from the soil sample. Hence consolidation will take place. But during vertical shear loading, drainage is not permitted.

(ii) Example: stability analysis of earthen dam during the sudden drawdown.

3. Consolidation Drain test (CD test):

(i) Drainage is permitted during the self-pressure (confining pressure) stage and shear stage both.

(ii) This test is the most time taking and for some soils may take several weeks. So, it is also called ‘slow test;

(iii) CD test is carried out for evaluation of long-term stability of the structure.

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