Degree

Doctor of Philosophy (PhD)

Department

Civil and Envirnomental Engineering

Document Type

Dissertation

Abstract

This dissertation comprehensively investigates the design, performance, and optimization of geosynthetic-reinforced pile-supported (GRPS) embankments, addressing critical geotechnical challenges in constructing road embankments over soft soils. GRPS systems, which integrate geosynthetic materials and pile foundations, enhance load distribution, reduce differential settlements, and ensure stability. However, inconsistencies in performance due to varying design methodologies necessitate a more systematic and holistic approach.

The research integrates extensive field investigations, parametric studies, and advanced finite element modeling (FEM) to evaluate and enhance GRPS performance. Real-world case studies, such as the LA1 Intracoastal Bridge and Amite River projects, are examined alongside numerical simulations to critically assess widely used design methods, including BS8006, EBGEO, Nordic, FHWA, and CUR226. Performance metrics—such as efficacy, stress concentration ratios, geosynthetic tensile strains, and settlement profiles—are analyzed to identify limitations and propose refinements. An innovative analytical framework based on elliptical soil arching is developed, overcoming the shortcomings of traditional circular arching theories and offering a more accurate representation of load transfer mechanisms.

The findings reveal the significant impacts of geosynthetic stiffness, pile spacing, embankment geometry, and construction sequencing on GRPS embankment performance. Parametric studies provide optimized configurations for geosynthetic layers and load transfer platforms, presenting practical guidelines for improving design efficiency and cost-effectiveness. The research also validates these insights through field instrumentation data, reinforcing the applicability of the proposed models in real-world conditions.

This dissertation bridges the gap between theoretical research and practical applications, contributing to the advancement of GRPS embankments as a sustainable and reliable solution for infrastructure development over challenging soft soils. By offering robust analytical models and actionable recommendations, this work supports the development of safer, more efficient, and resilient transportation systems, ultimately addressing global infrastructure demands.

Date

2-12-2025

Committee Chair

Murad Abu-Farsakh

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Available for download on Wednesday, February 04, 2032

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