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Say SPT was performed on silty clay medium (unit weight = 18 kN/m3) at 5 m depth. The water table was 2 m below the surface. SPT blow counts were 12/15/20. Calculate the corrected N value.
Ncorr1 = 15 + 0.5(Nraw-15)
Ncorr= Ncorr1 x C.F.corr2