Multiple choice

The number of blows observed in a Standard Penetration Test (SPT) for different penetration depths are given as follows:

 
Penetration of sampler Number of blows
0-150 mm 6
150-300 mm 8
300-450 mm 10

The observed N value is

  1. 8

  2. 14

  3. 18

  4. 24
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

 In standard penetration test (SPT), the number of blows required for first 15 cm penetration is no counted and treated as sheeting apparatus inside the soil and total number of blows for next two 15 cm blows is taken into account for the calculation of standard penetration test. So, N = 8 + 10 = 18

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