Numerical Modelling of Displacement Pile Resistance in Sand Ground. Part 1: Soil Physical Model, Calibration of Model Parameters

Vaidas Martinkus; Arnoldas Norkus; Džigita Nagrockienė

doi:10.7250/bjrbe.2021-16.516

Numerical Modelling of Displacement Pile Resistance in Sand Ground. Part 1: Soil Physical Model, Calibration of Model Parameters

Authors

Vaidas Martinkus CSD Engineers, Vilnius, Lithuania
Arnoldas Norkus Laboratory of Geotechnics, Vilnius Gediminas Technical University, Vilnius, Lithuania
Džigita Nagrockienė Vilnius Gediminas Technical University, Vilnius, Lithuania

DOI:

https://doi.org/10.7250/bjrbe.2021-16.516

Keywords:

displacement pile, numerical calibration of soil parameters, sand, soil physical model

Abstract

Accuracy of numerical modelling of ground resistance of the displacement pile highly depends on proper evaluation of its states: prior loading and its changes during the loading. Evaluation of initial ground stage, its subsequent changes caused by pile installation and, finally, evolution of the loaded pile resistance are the modelling stages that require validation with specialized test results performed under controlled laboratory conditions. Selection of the proper physical soil model and its parameters should be also done in accordance with the relevant soil tests results. The first paper briefly introduces testing results of a displacement pile prototype. Tests were conducted in the created sand deposit in the laboratory pit. Determining pile resistance and ground stress-strain distribution in the vicinity of the pile allows selecting the physical model for the soil. Numerical calibration of the parameters for the physical model of the selected soil was performed. The second, following paper will introduce analyses of pile resistance. It involves creation of a discrete model and its parameters, numerical modelling of pile resistance against vertical load. The pile ground resistance modelling applying the physical model of the selected soil includes the following stages: evaluation at rest stage and assessment of residual effects of installation and displacement pile loading resistance. Numerical analyses results were validated with displacement pile prototype testing results.

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