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 Standard
Penetration Test. SPT.
The
standard penetration test consists of driving a standard cone 60
centimetres into the earth, counting the number of blows necessary
to penetrate 15cm. This is carried out with a 63.5 kg hammer dropping
from a height of 76cm. The sum of the blow readings of the two central
sections of 15cm give the parameter Nspt. When the terrain is very
resistent the test is halted when 50 blows have been reached for
a depth of 15cm (Reject, R) and a note is made of the penetration
carried out.
The parameter Nspt enables us to calculate the resistance to the
dynamic cone penetration and it is correlated to the geomechanical
parameters.
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