On practical applications of the soil nail optimisation tool in cyclone recovery

Cyclones often inflict severe damage on soil structures, necessitating swift and effective recovery efforts. However, they also create multiple constraints for geotechnical engineering design solutions and construction, such as limited timeframes, and constrained budgets. Soil nailing reinforces unstable soil slopes, which have been crucial for restoring infrastructure post-disaster.

This paper investigates the practical applications of the Soil Nail Optimisation Tool (SNOT) developed by Michael Crisp (Crisp and Davies, 2024), particularly in the recovery work after Cyclone Gabrielle struck Auckland, New Zealand, in February 2023. The SNOT integrates Python coding and geotechnical data to facilitate the selection of soil nail lengths optimised for the site’s specific conditions. It reduces the time and cost of geotechnical design and, through optimisation, lowers construction costs. A case study based in the Waitākere Ranges in Auckland demonstrates how optimisation tools expedited recovery efforts while ensuring long-term stability. Furthermore, this paper discusses challenges and opportunities in implementing this tool, including cost considerations and technological advancements. This research underscores the significance of employing the SNOT in cyclone recovery projects, helping geotechnical engineers, disaster response agencies, and policymakers mitigate the impact of natural disasters on infrastructure and communities. Cyclones profoundly influence infrastructure and soil stability, posing significant challenges to disaster preparedness response and recovery efforts. Effective mitigation measures are essential for reducing vulnerability and enhancing resilience to cyclonic hazards.