Abstract
This paper presents a new method based on probability of soil type to evaluate the ultimate capacity of friction piles utilizing the CPT data. A database of thirty-five square PPC piles that were loaded to failure and their adjacent CPT profiles were used to develop this method. Backcalculation was carried out to calibrate the correlation factors needed to estimate the unit end bearing (qb) and unit skin friction (f) of the pile from CPT data (qc, fs) based on the probability of having each soil type. The ultimate pile capacities (QP) of the investigated piles evaluated by the proposed method, three other CPT methods, and the static method were compared with the measured pile capacities obtained from pile load tests. Statistical analyses were carried out to evaluate the reliability of the proposed CPT method and the results showed that the method can predict the ultimate capacity of the piles with good accuracy.
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