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Foundation Engineering

Standard Penetration Test

If an SPT tes...

Question

If an SPT test gave the average blow count of 32 in fine sand below water table, then what is the corrected value of blow count ?

A

22.1

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B

23.5

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C

24.2

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D

24.8

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Solution

The correct option is B 23.5
(b) Corrected SPT value

$N = 15 + \frac{1}{2} (N^{'} - 15)$

$= 15 + \frac{1}{2} (32 - 15)$

$15 + 8.5 = 23.5$

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