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Static and dynamic numerical analysis of anchored pile quay walls

Slavis Leandros

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Summary

This diploma thesis focuses on the study of the static, pseudostatic, and dynamic behavior of anchored quay walls, which are critical structural components of port infrastructure, especially in seismically active regions. The research aims to analyze the distress of these walls under static and seismic forces, applying advanced numerical methods and simulation models, with emphasis on the environmental and geotechnical parameters affecting their performance. In the theoretical part, the dynamic behavior of retaining walls is analyzed, and the factors influencing their stability, such as geometry, foundation conditions, soil properties, and seismic excitations, are examined. Main analysis methods are presented, including pseudostatic approaches and dynamic analyses using the finite element method, which is usually employed the numerical simulations.The research methodology involves developing numerical models using PLAXIS 2D software, which is widely used in geotechnical applications. The models represent three cases: (a) static analysis of on-shore anchored walls, (b) pseudostatic analysis of quay walls, and (c) dynamic analysis of quay walls under seismic loading. In this context, various geometrical configurations, seismic excitation levels, and soil conditions are examined to evaluate the effectiveness of quay walls under different scenarios. The study includes parametric analyses aiming to assess the behavior of walls under different loading conditions and geotechnical parameters. To investigate seismic response, dynamic excitations representing seismic scenarios with Ricker pulses and a recorded accelerogram are applied. The performance of different types of anchors and anchorage configurations is examined, along with the effects of foundation-wall interaction on displacements and stress distributions.The results present the distribution of soil stresses and deformations, as well as the dynamic response of the quay walls. The analyses reveal that anchored walls constitute an efficient retaining system, particularly under seismic conditions. The findings of the study demonstrate that the proposed design methods and numerical models can be utilized to optimize the stability of port infrastructure in seismically active regions. The thesis concludes with recommendations for future research, including the extension of simulations to three-dimensional models and the investigation of the effects of various soil types and construction materials. The development of relevant experimental tests would enable the validation of the numerical results and the more realistic assessment of the dynamic performance of quay walls under complex seismic conditions.

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