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Determination of Equivalent Average Cone Tip Resistance

An equivalent average cone tip resistance is obtained in the following way:

1)

Calculate the average tip resistance qc, mean at the tip of the pile by averaging qc values over a zone ranging from 1.5d below the pile tip to 1.5d above the pile tip (d is the pile diameter)

2)

Eliminate qc values in the zone which are higher than 1.3 multiple of the mean of the cone tip resistance qc, mean and those are lower than 0.7 multiple of the mean of the cone tip resistance qc, mean as shown in figure

3)

Calculate the equivalent average cone tip resistance qc, eq by averaging the remaining cone tip resistance qc values over the same zone that were  not eliminated (i.e. from values in the range 0.7 to 1.3 multiple of the cone tip resistance qc, mean).

Determination of equivalent average cone tip resistance qc, eq

Literature:

Tom Lunne, Peter K. Robertson, John J.M. Powell: Cone Penetration Testing in Geotechnical Practice, Spon Press, 1997, London.