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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,m 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 (dis 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,m and those are lower than 0.7 multiple of the mean of the cone tip resistance qc,m 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,m)

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.