Results
Completed the slope stabilisation safely and ahead of schedule, enabling the development to progress faster than planned.
Delivered a seismic-resilient solution using mesh and tensioned anchors instead of traditional shotcrete, improving long-term durability and sustainability.
Demonstrated adaptability with rapid method changes when encountering unexpected ground conditions, avoiding costly delays for the client.
Project
Solution
Utilised Geovert’s custom-built High Reach Drill, enabling the team to reach the entire face from the base without constructing benches. This allowed a single-phase excavation and stabilisation, significantly improving program efficiency.
Installed approximately 900m² of flexible Geobrugg mesh with 200 tensioned rock anchors, providing natural drainage and vegetation growth, and allowing the slope to move during seismic events.
Drilled open holes using a DTH (down-the-hole) hammer and completed anchor installation using rope access to limit crew exposure near the rotating drill.
When a localised collapse occurred, the team quickly adapted by switching the rotary drill to a backup top hammer kept onsite and installing grout-flushed hollow bar anchors already in stock, eliminating potential delays.
Project
Challenges
Fractured greywacke rock: Highly fractured ground posed stability risks during excavation.
Seismic considerations: The solution needed to allow for controlled movement during seismic events.
Time constraints: Cutting benches would significantly delay the earthworks program, so efficiency was critical.
Unexpected ground collapse: A localised area collapsed during drilling, requiring rapid redesign and method changes to avoid delays.
Project
Overview
A new commercial development on School Road in Wellington required the existing slope to be cut back to create a larger building footprint. Cutting back the fractured Wellington greywacke slope required an actively stabilised system to retain the face and maintain safety during construction.
Geovert was engaged to design and install a robust stabilisation solution that would allow the development to progress ahead of schedule while meeting the unique geotechnical and seismic requirements of the site.