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Driven precast piled foundations have significant advantages in respect of quality control over cast-in-place piles from the executive simplicity of the blow count diagrams to the theoretical sophistication of dynamic load tests there is always the possibility of fast and practical driving behavior check, homogeneity and even load capacities estimation. However, as the large number of available quality controls represents an advantage, that diversity can equally represent a disadvantage in respect to interpretation and methodology. Therefore, the present research compiled 881 records of dynamic load tests (708 on concrete piles and 173 on steel piles) and compared them with the resistance estimation with the Energy Approach Equation. The applicability of the equation was tested for both materials, especially when studying its main parameter (Ksp) variation related to several variables involved in pile driving, its empirical extremes and a calibration to the dynamic formula by means of Ksp. The study of the dynamic tests also led to the proposition of an equation to estimate the effective transferred energy to the pile in the hammer stroke by means of the blow count (set) and the elastic rebound. The study also devoted a section to the issue of dynamic compression stresses during driving, evaluating it through Gambini's Equation and proposing two alternative versions of that formula: a simplified one and a practical formulation in order to enable field estimations.

Monitoração dinâmica na cravação de estacas: aplicabilidade da equação de Energy Approach e estimativas das tensões de compressão.