Chapter 17, Problem 17.1P

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9th Edition

Braja M. Das + 1 other

ISBN: 9781305970939

Textbook Problem

ASTM D 1587-08 (2014) recommends the following dimensions for thin-walled steel tube sampling of soils for geotechnical purposes:

Calculate the area ratio for each case and determine which sampler would be appropriate for the following soil characterization tests: grain size distribution, Atterberg limits, consolidation, and unconfined compression.

To determine

Find the area ratio for each case and appropriate sample for the given soil characterization tests.

Answer

The area ratio for tube 1 is

The area ratio for tube 2 is

The area ratio for tube 3 is

Explanation

Given information:

The outside diameter

The outside diameter

The outside diameter

The wall thickness (*t*) for sample 1 is

The wall thickness (*t*) for sample 2 is

The wall thickness (*t*) for sample 3 is

Calculation:

Calculate the inside diameter

Substitute *t* in Equation (1).

Find the area ratio for

Here,

Substitute

Thus, the area ratio for tube 1 is

Calculate the inside diameter

Substitute *t* in Equation (1).

Find the area ratio for

Substitute

Thus, the area ratio for tube 2 is

Calculate the inside diameter

Substitute *t* in Equation (1).

Find the area ratio for

Substitute

Thus, the area ratio for tube 3 is

A soil sample usually can be considered undisturbed if the area ratio is less than or equal to 10%.

- All the given three samples are considered as undisturbed sample, hence, it is suitable for consolidation and unconfined compression test.
- The Grain size distribution, atterberg limits are conducted only when the soil on remolded or disturbed soil, hence, sample disturbance is not a factor.

Thus, the all three samples are appropriate for all tests.

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