Projects Completed to date:
Northland to Southland
Auckland Transport Landslide Remedials MSQA
Coromandel SH25 Temporary Working Platforms
Following the widespread landslides across Auckland in 2023 Auckland Transport initiated an extensive remediation programme to restore road safety and network resilience. Many of the sites involved complex failure mechanisms and challenging geological conditions e.g. non-engineered fill in large thicknesses and weak weathered rock.
We are the lead geotechnical engineers responsible for overseeing geotechnical construction monitoring across several of these remediation sites. Our role involves verifying that retaining structures, slope stabilisation measures, and drainage systems are constructed in accordance with geotechnical design requirements. The work frequently takes place in highly constrained construction environments, adjacent to live traffic, steep embankments, and sensitive underground services.
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Landslide Mapping in Queenstown
The Boundary Creek Bridge replacement on State Highway 25 is an infrastructure project delivered by NZTA Waka Kotahi as part of maintenance and resilience upgrades along SH25 between Thames and Coromandel. The existing bridge, which had been subject to speed and weight restrictions and operated under single-lane traffic due to deterioration from coastal exposure, was replaced with a new, stronger two-lane superstructure to improve safety, reliability and traffic flow along this scenic but critical coastal route. We were tasked with ensuring that the coastal bank was safe during the bridge replacement despite long-term erosion and in some areas existing displacement of the seawall. We designed and detailed a temporary working platform solution for the large crane which was to carry and install the bridge superstructure. ​​​
Taranaki Architectural Home
We carried out detailed landslide mapping and geohazard assessment for a proposed telecommunications site to identify existing slope instabilities and inform safe site development. The assessment included evaluating the age and activity of historical landslides through geomorphic interpretation, subsurface investigation, and review of historical records. We provided recommendations on the likelihood of future reactivation under seismic or extreme weather conditions, and outlined appropriate stabilisation measures such as drainage improvements and retaining structures. Our analysis also considered the potential consequences of slope movement on site access, structural performance, and service continuity, supporting informed design decisions and long-term resilience of the infrastructure.
This project involved a stunning architectural residence nestled in the hummocky, elevated terrain overlooking Mount Taranaki. The site presented unique geotechnical challenges due to its complex topography and underlying volcanic soils. We carried out detailed geotechnical investigations to assess ground conditions, followed by comprehensive slope stability analyses to ensure the long-term safety and performance of the foundation design. Close collaboration with the structural engineer allowed for a fully integrated solution tailored to the site’s natural features. We provided end-to-end support, assisting through the consenting process and delivering geotechnical construction monitoring to ensure the design intent was carried through to execution. The result is a secure, beautifully situated home that harmonises with its dramatic natural setting.
Dunedin Detailed Seismic Assessment
We undertook a Detailed Seismic Assessment (DSA) for an existing commercial warehouse located in Dunedin, a region characterised by alluvial soils and a heightened potential for liquefaction. Our scope included a targeted geotechnical investigation and detailed liquefaction assessment to inform the seismic performance of the site. Working closely with the structural engineer, we provided critical input to support their structural analysis and ensure alignment with current seismic design standards. Our collaborative, ground-up approach helped deliver a clear understanding of the building’s geotechnical risks, supporting informed decision-making for future use and potential strengthening works.