GATE CE 2015 Set 1 — Question 23
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Geotechnical Engineering → Subsurface Investigation → Disturbed & Undisturbed Samples
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Question
Which of the following statements is TRUE for degree of disturbance of collected soil sample?
Correct answer
(A) Thinner the sampler wall, lower the degree of disturbance of collected soil sample
Solution
The degree of disturbance in a soil sample is often quantified by the area ratio (), defined as , where is the outer diameter and is the inner diameter of the sampler. A thinner sampler wall means is closer to , resulting in a lower area ratio. A lower area ratio indicates less displacement of soil during sampling and thus a lower degree of disturbance. For undisturbed samples, should ideally be less than .
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