Abstract

Rockfalls, which result from the chemical and physical weathering of aging exposed rock cuts, occur frequently along many Kentucky roadways and can endanger travelers. Mitigating rockfalls often requires substantial excavation, procuring additional right of way, and/or hiring specialty contractors. An alternative to these expensive processes is rock scaling, which can be a cost-effective tool for mitigating rockfalls. Rock scaling entails removing loose and unstable rocks from rock cut slopes within the right of way to reduce rockfall risk and is being used with increased frequency by state transportation agencies around the country. The Kentucky Transportation Cabinet (KYTC) has completed several rock scaling projects. However, the agency lacks specifications or administrative guidance that staff can use to develop and execute projects. Based on information found in published literature, specifications issued by other agencies, and input from Cabinet staff, Kentucky Transportation Center (KTC) researchers developed the Rock Slope Scaling Guidance and Procedures Manual and construction specifications for rock scaling projects. The manual contains guidance on project prioritization, funding sources, developing contracts, inspection, post-construction monitoring, and other information staff need to develop and manage rock scaling projects. The specifications address contractor and personnel qualifications, submittals, construction requirements, quantity measurement, and pay items. Both documents give KYTC the flexibility to evaluate multiple methods for qualifying contractors, developing contracts, measuring quantities, and paying contractors on rock scaling projects.

Report Date

2-2025

Report Number

KTC-25-02

Digital Object Identifier

https://doi.org/10.13023/ktc.rr.2025.02

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