Shire Geotechnics Ltd were involved in several landslip jobs across the Auckland region following the rainfall event of January 27, 2023. These landslips posed unique challenges, and our team was called upon to conduct in-depth geotechnical assessments, often involving more extensive machine borehole testing and drone lidar survey work.
Shire Geotechnics Ltd was tasked with conducting a comprehensive geotechnical assessment for a residential development in Orakei, Auckland. The site presented a unique challenge, with steep terrain adorned, terraced retaining walls and close adjacent housing.
Shire Engineering Consultants has undertaken the geotechnical investigations for the dwelling development projects around Bremner Ridge, which is a residential area in Flat Bush.
The work completed in the projects includes reviews of the existing geological records and Council GIS, drilling of hand auger bore holes, monitoring of the groundwater levels, and measurement of cross sections using tapes and clinometers, etc.
We have conducted a thorough analysis of the ground conditions using the geological models and carried out the soil expansivity (shrink swell) tests in some of the sites. The completed reports include an analysis of the seismic hazards and the possibility of liquefaction of the soil over the long term. We have made relevant recommendations for the earthworks, foundations, and retaining walls.
Shire has been commissioned to complete the onsite stormwater management for a garage development project in Mount Eden.
The stormwater assessment is to support the resource of building consent applications. We have conducted a soil soakage test and issued a soakage report in addition to the geotechnical report for the site. The stormwater assessment includes the onsite soakage modeling and the falling head percolation test which is to determine the percolation rates.
The completed reports include our recommendations for the soakage device capacity and dimensions in compliance with the Council requirements.
One of our clients has had their timber pole retaining wall significantly damaged as a result of a landslip.
Shire has undertaken the geotechnical works, including the drilling of auger bore holes to determine the soil conditions, and a new design for the timber pole retaining wall on site to support the shed and the carpark.
The affected property is in Dairy Flat, which is north of Auckland.
We have reviewed the existing onsite wastewater systems and recommended a new location for the installation of the effluent disposal systems, which is a precautionary measure against ground instability. In addition, we have made effective recommendations on stormwater control and effluent disposal to ensure compliance with the Resource Management Regulations.
For this site, Shire has conducted an assessment of effects on the environment (AEE) for onsite effluent disposal. We have concluded that the proposed method of dripper irrigation is most appropriate for the soil type as it provides sufficient groundwater and surface water protection. No parties are considered to be adversely affected by the onsite wastewater disposal systems.
Landslip remedial designs for residential and commercial sites.
We have been commissioned to work on the landslip sites across Auckland, following the adverse weather conditions with heavy rainfall in January, 2023.
The landslips have caused significant issues on the sites and we have been called in to conduct in depth geotechnical assessments with extensive machine borehole testing as well as drone lidar surveying works.
Upon completion of the fieldwork, we investigated the intricacies of the terrain to establish comprehensive ground models. We undertook slope stability assessments to uncover the mechanisms behind the slips to allow us to provide detailed guidance on the best remedial measures for the sites affected by the heavy rains.
Our recommendations include the design of remedial works involving gabion baskets, timber pole retaining walls, and barrier pile walls. We are experienced in the areas of site walkovers for scoping, investigations and the development of solutions to increase the longevity of the landscapes and its resistance to the landslip hazards.
2/17 College Road, Northcote Auckland 0627
Copyright 2024. All Rights Reserved 
