The regression data were applied to develop the correlations between qc and SPT value (N60). The test data were employed to examine accuracy of the correlation compared to the available relationships for the same soil type. The results indicate that the proposed relationships between qc and N60...
The standard penetration test (SPT) is a widely used in situ test method worldwide that can evaluate soil properties based on the blow counts (N-value). The N-value depends on soil properties, and the energy transferred to the drill pipe during hammering. Currently, European and American sch...
However, there are no published data supporting commonly used value in Egypt. This paper presents an evaluation of the energy efficiency of the Donut and Safety hammers commonly used in Egypt and the associated energy correction factor. The energy efficiency is estimated by comparing N-values from...
SPT CAL Since 2010 we have performedSPT Hammer Energy Measurementsfor standard penetration test hammers to get efficiency ratings which can then be used to adjust blow count N values to a normalized N60 value. This is sometimes called aHammer Calibration,Hammer Energy Calibration, Hammer Energy Tes...
If SPT N values were normalized to N60 as per Equation 1, then the SPT N60 value (10) would be the same for data from both the hammers. This demonstrates that uncorrected SPT N values should not be used for any interpretation soil properties, as it would be misleading. Therefore, any...
In addition, the correlation between cone tip resistance (qc) and SPT N60-value shows very strong relationship which is very similar to proposed Meyerhof correlation. Furthermore, the relations between other mentioned parametres also shows a valid correlations similar to other authors....
The parameters include SPT-N value corrected for field procedures (N60), relative density (Dr), void ratio range (emax–emin), effective overburden stresses (σv') and in-situ dry density (γdf). Based on the results of correlation analyses, it was observed that SPT-N values alone ...
This contact zone has shown distinct geological features with the characteristic of a lower N60 value underlying stiff strata. According to the EM/Eur ratio, the maximum value of 7 indicated that this zone is unpredicted in initial and unload鈥搑eload stiffness compared to the non-contact zone...