University of Twente Student Theses
The influence of the numerical approach on pre-augering on sheet pile design
Dongen, N.J. van (2023) The influence of the numerical approach on pre-augering on sheet pile design.
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| Abstract: | The effect of the installation technique pre-augering on the soil while installing sheet piles is a relatively unexplored area, while it has impacts on the final design of sheet piles. The current regulating standards consider a reduction factor that was based on the sheet pile installation technique of fluidization, while it is very likely the impact of these installation techniques on surrounding soils is very different. This study further analyses the difference between fluidization and pre-augering, and ultimately creates a quantitative analysis of this reduction area to increase the information available on pre-augering. This research aims to analyze the impact of the method of numerically analyzing the dike sheet pile design on the final sheet pile length. But also analyzing the validity of the reduction factor assumption made by the POVM Publication longitudinal constructions (PPL). As the influence of this reduction factor can influence the sheet pile design and thus the safety of the residents living in proception of the dikes. First, the validity of the reduction factor is reviewed, by observing the theory of both installation methods. Secondly, previously performed research is analysed to create a framework of experiments that should be performed. Then an accurate numerical model is made, using the base model of the Tiel-Waardenburg reinforcement project. Which is used to perform analysis on the effect of the method of implantation on the sheet pile length. The use of numerical analyses comes with several uncertainties including soil parameter variability, schematization of geometries, uncertainties within the soil model, etc. but generally shows reliable results. When implementing methods to take the inaccuracies into account. After performing the numerical analysis, the reduction factor shows a significant trend with the sheet pile design. As the reduction factor decreases, the length of the sheet pile increase, whereas an increase in the reduction factor leads to a decrease in the length. This is primarily because the reduction factor directly influences the soil's stiffness and interface strength parameters, serving as a multiplier for these parameters. Consequently, a lower reduction value results in lower stiffness and interface strength parameters. While the reduction factor shows significant impacts on the sheet pile design, the area of the reduction factor, currently only considered inside the packed sand layer, is comparatively less significant. Nevertheless, some correlations are found resulting in some enlarging or reducing of sheet pile design. The theory concerning fluidization and pre-augering, shows a very different effect occurring. The current assumption of the reduction factor is caused by a deficit in both fluidization and pre-augering knowledge. Nevertheless, the estimation of the pre-augering reduction factor should be further investigated, as the numerical analysis performed in this study shows the significant impact the reduction factor has on the sheet pile design, leading to shorter sheet piles, and creating a higher cost-effective sheet pile design. |
| Item Type: | Essay (Bachelor) |
| Faculty: | ET: Engineering Technology |
| Programme: | Civil Engineering BSc (56952) |
| Link to this item: | https://purl.utwente.nl/essays/96636 |
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