ABSTRACT
In 2023, a cyclone caused wind and rain damage to road infrastructure, including a 600m long highway along the coral sea coastline of which batter slopes suffered instability with failure scarps reaching the road corridor. This paper details the slope remediation design, includ-ing risk assessments, geotechnical investigations, back analyses, inferred mode and mechanism of the failure, and slope remedial measures. The analyses also extend to quantify the drag force resulting from wind gust on trees based on published wind tunnel studies, and its impact on slope instability through limit equilibrium and numerical methods as this is often overlooked in design.
