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The observed N value from a standard penetration test conducted on a saturated sandy soil stratum is 35. The corrected N value for dilatancy can be estimated as:
  • a)
    25
  • b)
    45
  • c)
    20
  • d)
    15
Correct answer is option 'A'. Can you explain this answer?
Verified Answer
The observed N value from a standard penetration test conducted on a s...
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.

Given,
N value = 35
Corrected  value for dilatancy is 

N'' = 15 + 10 = 25
∴ Corrected value N'' = 25 
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Most Upvoted Answer
The observed N value from a standard penetration test conducted on a s...

Explanation:

1. Standard Penetration Test (SPT) N value:
- The observed N value from the standard penetration test conducted on a saturated sandy soil stratum is 35.

2. Correcting for Dilatancy:
- When correcting for dilatancy in sandy soils, the N value is typically reduced by about 10 units.
- This correction is made to account for the tendency of sandy soils to dilate and lose strength during shearing.

3. Calculation:
- To estimate the corrected N value for dilatancy, we subtract 10 units from the observed N value.
- Therefore, the corrected N value can be estimated as: 35 - 10 = 25.

4. Answer:
- The correct answer is option 'A' which is 25.

Therefore, the corrected N value for dilatancy in this case would be 25.
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The observed N value from a standard penetration test conducted on a saturated sandy soil stratum is 35. The corrected N value for dilatancy can be estimated as:a)25b)45c)20d)15Correct answer is option 'A'. Can you explain this answer?
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