GATE Civil Engineering (CE) 2020 Shift 1 Solved Paper

Question : 27 of 65

Marks: +1, -0

In a soil investigation work at a site, Standard Penetration Test (SPT) was conducted at every

1.5 {m}

interval up to

30 {m}

depth. At

3 {m}

depth, the observed number of hammer blows for three successive

150 {mm}

penetrations were

8.6

and 9, respectively. The SPT

{N}-

value at

3 m

depth is

Solution:

Blows for first

150 {mm}

is not noted. Thereafter for next

300 {mm}

penetration number of blows are counted.

∴

SPT value

=9+6=15

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