What is a split spoon sampler used for?

Solution (By Examveda Team)

Let's understand what a Split Spoon Sampler is and why it is used.

A split spoon sampler is a commonly used sampling device in geotechnical site investigations. It is primarily used during the Standard Penetration Test (SPT) to collect disturbed soil samples from a borehole while also helping determine the soil's strength and density.

The sampler is a hollow steel tube that is driven into the soil using repeated hammer blows. During this process, the soil inside the sampler gets compressed and its natural structure is disturbed. As a result, the collected sample is classified as a disturbed soil sample rather than an undisturbed one.

Option A: Sampling rock cores

This is incorrect. Rock cores are obtained using core barrels with diamond or carbide drill bits, not a split spoon sampler.

Option B: Sampling water

This is incorrect. Water samples are collected using specialized groundwater sampling equipment or pumps.

Option C: Collecting disturbed soil samples

This is correct. Since the split spoon sampler is driven into the ground by hammer blows, it collects disturbed soil samples. These samples are suitable for soil identification and classification but not for determining the soil's undisturbed engineering properties.

Option D: Collecting undisturbed soil samples during SPT

This is incorrect. The driving action of the Standard Penetration Test (SPT) disturbs the soil. Undisturbed samples are collected using devices such as the Shelby tube sampler or a piston sampler.

Therefore, the correct answer is Option C: Collecting disturbed soil samples.

Exam Tip: Remember the simple rule: Split Spoon Sampler → SPT → Disturbed Sample, whereas Shelby Tube Sampler → Undisturbed Sample.