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Classification of Fine Grained Soil

Consider the ...

Question

Consider the following statements:
1. For a well graded sand, the coefficient of curvature should lie between 1 and 3.
2. A soil having uniformity coefficient smaller than about 2.0 is considered uniform.
Which of these statements is/are correct?

A

Both 1 and 2

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B

Neither 1 nor 2

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C

1 only

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D

2 only

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Solution

The correct option is A Both 1 and 2
(a)
For a soil to be well graded coefficient of curvature $(C_{u})$ must lie between 1 and 3. In addition to this coefficient of uniformity $(C_{u})$ must be greater than 4 for gravels and greater than 6 for sands.
$A s o i l i s s a i d t o b e v e r y u n i f o r m, i f C_{u} < 5$ $; i t i s s a i d t o b e o f m e d i u m u n i f o r m i t y i f C_{u} = 5 t o 15$ $; a n d i t i s s a i d t o b e v e r y n o n - u n i f o r m o r w e l l g r a d e d, i f C_{u} > 15$ .

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