Dynamic load testing with increasing energy for high bearing capacity piles
DOI:
https://doi.org/10.24849/j.geot.2020.150.02Keywords:
Dynamic load testing, increasing energy, bored pile, high bearing capacity pileAbstract
This work aims to present a new methodology for the execution and interpretation of dynamic load tests (ECD) of increasing energy for cast-in-place bored high bearing capacity piles. The execution methodology demands specific technical criteria to define the impact system to perform the dynamic load test in order to carry out with increasing energy. The requirements of the hammer are described in detail, as well as the procedures for the preparation and execution of the test. Based on the innovative concept of normalized potential energy, a new proposal is presented to estimate the required potential energy according to the compressive resistance to be mobilized. The interpretation methodology based on CAPWAP (Case Pile Wave Analysis Program) numerical analysis for each blow of increasing energy, allows the drawing of envelope curves for the lateral, base and total resistances as a function of the displacements. This methodology provides a whole set of relevant information that makes it possible to clearly assess the mechanisms of load transfer between the shaft and the tip of the pile. It also considers the proposal of a displacement that corresponds to the conventional failure load defined from the elastic shortening and the displacement of the tip of the pile.
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