PREDICTION OF TRANSFERRED ENERGY OF TUBED PILES DRIVEN IN AMAZON SOIL-PPT Presentation

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The study evaluates Querelli’s (2019) method for estimating the effective energy transferred to driven piles using measurements of permanent set and elastic rebound. Unlike approaches that require hammer-efficiency measurements, the method uses these displacement measurements together with pile properties, including its geometry, material, and length. Its main calibration parameter, λ, is site-specific.<br /><br />The method was applied to 64 dynamic load-test records from steel tubular piles driven in Amazon-region soils. The piles were 20–30 m long, with a 40.6 cm diameter and 9.5 mm wall thickness. After calibrating λ for the site, the predicted effective energy showed excellent agreement with measured energy, with a reported correlation coefficient of 0.986. The calibration yielded λ = 1.1095 (equivalently, 1/λ = 0.812).<br /><br />The authors conclude that the method can support practical quality control of driven foundations and, once calibrated, can estimate effective energy for piles under the same site conditions without further PDA instrumentation or hammer-efficiency measurements. They emphasize that accuracy improves with site-specific calibration and that, like any estimation method, it has limitations.

Keywords

effective energy

driven piles

permanent set

elastic rebound

pile driving

dynamic load test

steel tubular piles

site-specific calibration

Querelli method

foundation quality control