Abstract
The present study reports the extensive comparison of model tests with numerical simulations of vibro-driven pile installation in saturated sand. The purpose of the study is to validate existing simulation techniques and to investigate the ability of those to reproduce effects experimentally observed during pile installation. A limited number of cycles has been considered and the focus is placed on the cyclic evolution of soil deformations and stresses. Two axisymmetric FE models have been developed for the simulation of model tests. In the first, the pile-soil interaction is modeled in a simplified way by applying a sinusoidal displacement boundary condition at the soil-pile interface close to the pile toe. The second model simulates the performed model tests more realistically by including the pile-oscillator system. The \(\mathbf {u}\)-p formulation has been adopted in both models for the dynamic analysis of fluid-saturated solids with nonzero permeability. A hypoplastic constitutive model with intergranular strain has been selected to describe the mechanical behavior of the soil. The soil displacements and the evolution of pile resistance are compared. The good agreement between the results confirms that the pile installation process can be satisfactory reproduced numerically.
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Acknowledgments
The study was financed by the Deutsche Forschungsgemeinschaft as part of the Research Unit FOR 1136 ‘Simulation of geotechnical construction processes with holistic consideration of the stress strain soil behaviour’, Subproject 6 ‘Soil deformations close to retaining walls due to vibration excitations’.
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Chrisopoulos, S., Vogelsang, J., Triantafyllidis, T. (2017). FE Simulation of Model Tests on Vibratory Pile Driving in Saturated Sand. In: Triantafyllidis, T. (eds) Holistic Simulation of Geotechnical Installation Processes. Lecture Notes in Applied and Computational Mechanics, vol 82. Springer, Cham. https://doi.org/10.1007/978-3-319-52590-7_5
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DOI: https://doi.org/10.1007/978-3-319-52590-7_5
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