The subject of this diploma thesis was a comprehensive analysis of geotechnical interactions arising during the construction of a high-speed rail (HSR) embankment in the immediate vicinity of an existing highway embankment. The main objective of the work was to determine the effects of additional loading on the subsoil and the highway embankment, to design and assess mitigating measures, and to propose a monitoring system concept.
The theoretical part described the specifics of the given locality, including engineering geological conditions with a dominance of fine-grained Neogene soils characterized by high plasticity and compressibility. Furthermore, a literature review and classification of available geotechnical solutions for the foundation and stabilization of high embankments were carried out. The practical part focused on numerical modeling of embankment interaction using Plaxis 2D software and the finite element method. For the subsoil, the Hardening Soil Model (HSM) was applied, while for structural elements, the Mohr-Coulomb Model (MCM) was used.
The analysis of the initial state without any measures revealed cumulative settlement under the HSR embankment axis and under the highway embankment. The achievement of 95% primary subsoil consolidation was predicted to take approximately 124 years. These findings unequivocally emphasized the necessity of implementing geotechnical measures. Subsequently, an analysis of two alternative solutions was performed: the application of vibro-stone columns and a grouted curtain. Vibro-stone columns led to a significant reduction in the 95% consolidation time to approximately 50 years. The alternative solution with a grouted curtain demonstrated a reduction in the highway embankment's settlement, albeit at the cost of extending the consolidation time to approximately 133 years.