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Question

In a soil investigation work at a site, Standard penetration test (SPT) was conducted at every 1.5m interval up to 30m depth. At 3 m depth, the observed number of hammer blows for three successive 150 mm penetration were 8, 6 and 9, respectively. The SPT N-value at 3 m depth, is

A

15
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B

23
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C

14
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D

17
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Solution

The correct option is A
15
The SPT value is taken as last 300 mm so neglect the SPT of first 150mm
so, SPT N value at 3 m depth = 6 + 9 = 15

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