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The observe N value from a standard penetration test conducted on a saturated sandy soil is 30; the N - value corrected for dilatancy may be taken as:
1. 15
2. 20
3. 23
4. 29

1 Answer

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Best answer
Correct Answer - Option 3 : 23

Explanation

Dilatancy correction:

It is to be applied when N’ obtained after overburden correction, exceeds 15 in saturated fine sands and silts. IS: 2131-1981 incorporates the Terzaghi and Peck recommended dilatancy correction (when N’ > 15) using the equation

\(N'' = 15 + \frac{1}{2}\left( {N'-\;15} \right)\)

Given,

N value = 30 

Corrected  value for dilatancy is 

\(N'' = 15 + \frac{1}{2}\left( {30-\;15} \right)\)

N'' = 15 + 7.5 = 22.5

∴ Corrected value N'' = 22.5 , So closet option is Option 3

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