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Question 9.2: 75 mm is the external diameter of a sampling tube. If the ar...

75 mm is the external diameter of a sampling tube. If the area ratio required is 20%, determine the thickness of the sampling tube. In what type of clay would such a high area ratio be required?

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A_{r}=\frac{75^{2}-d_{i}^{2}}{d_{i}^{2}}=0.20

 

Solving d_{i}=68.465 mm.

 

The wall thickness =\frac{75.0-68.465}{2}=3.267 mm

 

When samples are to be taken in very stiff to hard clay soils mixed with stones, sampling tubes with high area ratios are required.

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