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Foundation Engineering

Standard Penetration Test

The observed ...

Question

The observed value of the standard penetration number (N) at 10m depth of a silty sand deposit is 13. The unit weight of the soil is $16 k N / m^{3} .$ The N value after correcting for the presence of fines will be :

A

12

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B

13

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C

14

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D

15

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Solution

The correct option is B
13
Presence of fines $\Rightarrow$ Diltancy correction will be applied.
But it is applied only when N > 15.

Here N < 13
$\Rightarrow N = 13$

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