PREDICTION OF TRANSFERRED ENERGY OF TUBED PILES DRIVEN IN AMAZON SOIL-Video

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The presentation examines estimating the effective energy transferred to driven piles using measurements of permanent displacement (set) and elastic rebound. In Brazil, these measurements are commonly used for pile-driving control, while dynamic tests measure force and velocity to calculate energy. The proposed Kirelli method estimates energy from set and rebound, with a site-specific parameter, lambda, calibrated using dynamic-test data.<br /><br />Case studies from Rio de Janeiro and Santos showed strong correlations between predicted and measured energy. The method was also applied to steel tubular piles in alluvial soils near Juruti and Oriximiná in the Amazon, where river levels fluctuate substantially. For 64 dynamic-test records, the calibrated equation achieved an R² of about 0.98, with lambda equal to 0.81.<br /><br />The presenter concludes that, after calibration, the method can support pile-driving quality control without ongoing instrumentation under comparable site conditions. However, lambda varies by site, and the method has limitations like any empirical formula.

Keywords

pile driving

effective energy

permanent displacement

elastic rebound

dynamic test calibration

Kirelli method