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Foundation Engineering

Standard Penetration Test

Standard pene...

Question

Standard penetration test (SPT) was conducted at a site. The recorded values of blow count for every 15 cm penetration at depth of 1 m are 5, 9 and 10 respectively. The water table was at the ground surface. The grain size classification showed that the size contained 40% fine sand and 60% silt. the value of SPT blow count(N) that should be used for overburden correction is ..........
19

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Solution

The correct option is A 19
The reading of first 15 cm penetration is not considered in SPT value, N. For further 30 cm penetration,
No. of blows = 9 + 10 = 19
N = 19 is the SPT N- value without correction which is to be used for overburden correction.

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