GATE CE 2020 Set 1 — Question 21
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Geotechnical Engineering → Subsurface Investigation → Standard Penetration Test
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Question
In a soil investigation work at a site, Standard Penetration Test (SPT) was conducted at every interval up to depth. At depth, the observed number of hammer blows for three successive penetrations were , and , respectively. The SPT N-value at depth, is ______.
Correct answer
(C) 15
Solution
The Standard Penetration Test (SPT) N-value is defined as the sum of the number of blows required for the second and third intervals of penetration (total after the initial seating drive).
Given blows for three successive penetrations: .
Given blows for three successive penetrations: .
- First (seating drive): blows (ignored in N-value calculation)
- Second : blows
- Third : blows
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