Soil Exploration MCQ with answer and solution

Concept

Disturbed samples from a split spoon sampler

Step-by-step solution

1. A split spoon sampler (SPT sampler) gives a disturbed but representative sample. 2. Disturbed samples can be used for index tests such as sieve analysis. 3. Consolidation and triaxial tests need undisturbed samples.

Explanation

The thick-walled split spoon sampler, which is driven in the SPT, remoulds the soil. Its sample can be used for classification (grain size, Atterberg limits) but not for strength or compressibility tests.

Shortcut

Split spoon → disturbed → index tests. Shelby tube → undisturbed → strength/consolidation.

Common mistake

Assuming that all samples can be used for all tests.