Abstract

Reinforced soil slopes (RSSs) can be a feasible solution for embankments where there exist right of way re-strictions, environmental issues, rolling or mountainous topography, unfavorable geology, and other limiting fac-tors. They can be an alternative to retaining walls or importing select fills to construct steeper, stable embankment slopes where flatter embankment slopes may result in unwanted impacts, costs, and maintenance issues. Thisreport discusses the advantages and limitations of using geosynthetic reinforcement to construct RSSs. Researchers investigated current design, specification, and construction practices to determine which practices can be adopted by the Kentucky Transportation Cabinet (KYTC). Specifications were developed for using locally available soil materials to construct RSSs where select granular fill is not readily available or cost prohibitive. A standard RSS design was developed that reduces design and review time, supports a more equitable bid environment for contractors, and encourages further use of the technology. Researchers also updated KYTC’s Special Note for Reinforced Soil Slopes and prepared guidance on using RSSs. It expands on information in the Cabinet’s Geotechnical Guidance Manual and includes information on design requirements, selection of an appropriate earth retention system, design methodologies, material selection, and plan development. The results of the study can help KYTC expand use of RSSs as well as the use of locally available soils for constructing RSSs, when appropriate.

Report Date

7-2025

Report Number

July 2025

Digital Object Identifier

https://doi.org/10.13023/ktc.rr.2025.16

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