Which of the following statements is TRUE for degree of disturbance of collected soil sample?

Question

Which of the following statements is TRUE for degree of disturbance of collected soil sample?

Thinner the sampler wall, lower the degree of disturbance of collected soil sample
Thicker the sampler wall, lower the degree of disturbance of collected soil sample
Thickness of the sampler wall and the degree of disturbance of collected soil sample are unrelated
The degree of disturbance of collected soil sample is proportional to the inner diameter of the sampling tube

LohaHridoy

5 views

2025-01-04 04:42

1 Answers

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AhmedNazir · Accepted Answer · 2022-09-04T04:29:57+06:00

Option 1 : Thinner the sampler wall, lower the degree of disturbance of collected soil sample

Concept:

There are two types of soil samples

1) Disturbed soil samples:

These are the samples in which the natural structure of the soil gets disturbed during sampling.

These samples can be used to determine the index properties of soil, such as grain size, plasticity characteristics, specific gravity.

The samplers used to get disturbed samples is split spoon sampler

2) Undisturbed soil samples:

These are the samples in which the natural structure of the soil does not get disturbed. But we should know that, it is impossible to get a truly undisturbed soil sample.

These are samples are used for determining engineering properties of the soil such as compressibility, shear strength, and permeability, and also shrinkage index.

the samplers used to get undisturbed samples are shelby tubes and thin walled sampler, piston sampler, and hand carved sampler

The smaller the degree of disturbance, the greater will be the reliability of the results.

Explanation:

The factors affecting the degree of disturbance are as follows,

Factors affecting degree of disturbance	Value to obtain undisturbed soil sample
Area ratio	≤ 10 %
Inside clearance	0.5 to 3.0 %
Outside clearance	0 to 2 %
Recovery ratio	96 to 98 %
Inside wall friction	The inside wall of sampler should be smooth
Non-return valve	Should have large orifice area
Method of apply force	The sampler should be pushed and not driven

The sampler having thinner wall like Shelby tube have a lesser area ratio (i.e 6 to 9 %) hence thin wall samplers are used for getting undisturbed samples

The sampler having a thicker wall, like split spoon sampler has a larger area ratio (i.e up to 110 %), hence it is impossible to get the undisturbed sample with thicker wall sampler.