An unprecedented weather event in 2023 caused a landslide blocking part of SH1 near Dome Valley, North of Auckland.

The Epitaph Landslide had posed persistent threats to a coastal segment of State Highway 6 for several decades.

Following Cyclone Gabrielle, GSI was contracted by Fulton Hogan for specialised slip repair work on Lone Kauri and Karekare Roads in West Auckland.

Cyclone Gabrielle caused major damage to Mountain Road in the Waitakere ranges, forcing a full closure.

As part of Cyclone Gabrielle recovery efforts, GSI, in partnership with Andy O’Sullivan engineers, was contracted by NZTA for a design-and-build project to repair an overslip at Ruamahunga.

Significant flooding in West Auckland caused a significant landslide on Te Henga Road, leading to the closure of the eastbound lane.

This site, 35 km southeast of Waipukurau, had experienced ongoing movement for two several years, damaging the integral transport route of Wimbledon Road.

Under a subcontract by Fulton Hogan we were tasked to design and construct CFA unreinforced concrete piles and a geosynthetic confined soil (GCS) retaining structure

GSI was engaged under sub-contract to undertake specialist jet grouting works to improve compromised soils beneath a partially constructed building.

Marshall Projects engaged GSI to deliver specialist In-Situ Mass Stabilisation (IMS) ground improvement works for the new Motuoapa Water Treatment Plant.