Numerical analysis of large-diameter bored piles in sandy soil

Resumo

The paper presents a numerical model to analyze the load transfer mechanisms and load-displacement
patterns of large-diameter bored piles in sandy soil. The model is calibrated using a seven-layer soil profile,
encompassing dense to loose sand layers and a silty-sandy clay layer located between depths of 18 m to 22 m. The
pile and soil materials are represented with elastic model and Mohr-Coulomb elasto-plastic model, respectively.
Discrepancies between experimental and numerical load-displacement curves are evident, particularly when
calibrating the model with reference experimental and lab-derived soil parameters. Adjusting interface friction
angles and reducing soil elastic moduli aligns the pile's behavior with numerical predictions for bentonite cases.
However, polymer-modified cases display higher values and require more extensive parameter modifications.
Discussing the effects of polymers and bentonite on lateral resistance, coupled with a comparison of the β
coefficient, coefficient of lateral earth pressure (K), and frictional coefficient (μ) between numerical and
experimental data, deepens the comprehension of bored pile behavior in sandy soils.