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Foundation Engineering

Standard Penetration Test

The number of...

Question

The number of blows observed in a standard penetration Test (SPT) for different penetrations depths are given as follows
penetration of sampler number of blows

0 - 150 6

150 - 300 8

300 - 450 10

The observed N value is

A

8

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B

14

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C

18

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D

24

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Solution

The correct option is C
18
In standard penetration test, the number of blows required for first 15cm penetrations is not counted and treated as sheeting apparatus inside the soil and total number of blows for next two 15cm blows is taken into account for the calculation of standard penetrations test. So, N = 8 + 10 = 18

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