ABSTRACT
A large number of bored CFA piles was installed during the construction of a big treatment plant in Poggiomarino (Naples), where the subsoil is formed by sub-horizontal strata of alluvial soils of pyroclastic origin interbedded with organic silt layers, overlying the pyroclastic base formation. The installation parameters of CFA piles (rate of revolution, rate of penetration, torque, etc.) have been recorded during construction. In the paper the statistical correlation between CPT results and monitoring data of CFA piles installation was analysed. The statistical correlation allowed evaluating the bearing capacity of each CFA pile based on the monitoring of installation data. The correlation was developed by considering different pile groups located around the CPT verticals, in order to analyse the sensitivity to the spatial variability of geotechnical subsoil properties. The statistical based prediction of bearing capacity was validated by considering two load tests on pilot CFA piles at the study site.
