Piston samplers, employing a thin-walled tube, are most commonly used for the collection of less disturbed samples.
2.
The standard penetration test ( SPT ), which uses a thick-walled split spoon sampler, is the most common way to collect disturbed samples.
3.
Atterberg limits tests, water content measurements, and grain size analysis, for example, may be performed on disturbed samples obtained from thick walled triaxial shear and unconfined compression test.
4.
A disturbed sample is one in which the structure of the soil has been changed sufficiently that tests of structural properties of the soil will not be representative of in-situ conditions, and only properties of the soil grains ( e . g ., grain size distribution, Atterberg limits, and possibly the water content ) can be accurately determined.
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