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Cost–Benefit Analysis Methodology for Slope Stabilization Based on Probabilistic Stability Analyses

Robson, Ellen; Milledge, David; Utili, Stefano; Bründl, Michael

Cost–Benefit Analysis Methodology for Slope Stabilization Based on Probabilistic Stability Analyses Thumbnail


Authors

David Milledge

Stefano Utili

Michael Bründl



Contributors

Cholachat Rujikiatkamjorn
Editor

Jianfeng Xue
Editor

Buddhima Indraratna
Editor

Abstract

It is best practice to evaluate the cost-efficiency of different road cut slope stabilization measures, prior to designing new cut slopes or stabilizing existing ones. This can be done by conducting a cost analysis. Most cost analysis methodologies require large datasets that are costly and time-consuming to establish (e.g. databases of historical data or in-situ test results). We present a new cost–benefit analysis (CBA) methodology based on direct cost estimates and a rigorous but parsimonious mechanistic and probabilistic geotechnical slope stability assessment that can be used to evaluate the cost-efficiency of different stabilization measures for a single-cut slope. Probabilistic stability analyses are coupled with a hillslope-hydrological model (the hillslope-storage Boussinesq model) based on the CUTSTAB-P method to determine the frequency of a cut slope failure over a prescribed period. By determining the frequency of the cut slope failure, the cost of failure (remediation) over a prescribed period is established. The cost of failure for a particular cut slope design is combined with the initial upfront investment and running maintenance costs to determine the cost efficiency of implementing the stabilization measures over the entire cut slope lifetime. This methodology is suitable to compare the cost efficiency of many different stabilization designs. Unlike other cost analyses for slope stability, our methodology accounts for uncertainty in slope geomaterial characteristics, as well as for hillslope hydrology.

Citation

Robson, E., Milledge, D., Utili, S., & Bründl, M. (2024, November). Cost–Benefit Analysis Methodology for Slope Stabilization Based on Probabilistic Stability Analyses. Presented at ICTG 2024, Sydney, Australia

Presentation Conference Type Conference Paper (published)
Conference Name ICTG 2024
Start Date Nov 20, 2024
Acceptance Date Oct 1, 2024
Online Publication Date Oct 24, 2024
Publication Date 2025
Deposit Date Oct 29, 2024
Publicly Available Date Oct 30, 2024
Publisher Springer Nature
Peer Reviewed Peer Reviewed
Pages 187-193
Series Title Lecture Notes in Civil Engineering
Series Number 403
Series ISSN 2366-2565
Book Title Proceedings of the 5th International Conference on Transportation Geotechnics (ICTG) 2024, Volume 2
ISBN 9789819782161
DOI https://doi.org/10.1007/978-981-97-8217-8_20
Public URL https://durham-repository.worktribe.com/output/2992852

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