Davis Ogilvie played a crucial role in providing geotechnical engineering expertise for the restoration efforts in the picturesque French Pass, located in Marlborough Sounds.
The site, a historically landside gully, was affected by the severe weather event in 2021. The excessive rainfall led to the oversaturation of the underlying colluvium (loose sediment), resulting in a substantial under-slip that impacted approximately 70 meters of the road alignment, subsequently reducing it to a single lane. Due to the vulnerability of the site, the chosen remediation strategy involved repositioning the road by cutting into the existing hillside and restoring it to its pre-storm conditions.
A 1.7 metre-high timber retaining wall was constructed at the most ‘at-risk’ point of the site with increased drainage and concrete lined swales. Loose and weak soils were removed from the exposed faces and hydroseeded (a planting process and erosion control technique); to decrease the erosion and increase the overall site slope stability.
Thank you to the Marlborough Roads Recovery Team and Edridge Contracting for all of their hard work on the project.
Marlborough Roads Recovery Team
Davis Ogilvie played a crucial role in providing geotechnical engineering expertise for the restoration efforts in the picturesque French Pass, located in Marlborough Sounds.
The site, a historically landside gully, was affected by the severe weather event in 2021. The excessive rainfall led to the oversaturation of the underlying colluvium (loose sediment), resulting in a substantial under-slip that impacted approximately 70 meters of the road alignment, subsequently reducing it to a single lane. Due to the vulnerability of the site, the chosen remediation strategy involved repositioning the road by cutting into the existing hillside and restoring it to its pre-storm conditions.
A 1.7 metre-high timber retaining wall was constructed at the most ‘at-risk’ point of the site with increased drainage and concrete lined swales. Loose and weak soils were removed from the exposed faces and hydroseeded (a planting process and erosion control technique); to decrease the erosion and increase the overall site slope stability.
Thank you to the Marlborough Roads Recovery Team and Edridge Contracting for all of their hard work on the project.
Marlborough Roads Recovery Team
