Karekare Beach Residence, Sand Dune Stabilisation

By GWE Consulting Engineers

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Karekare Beach Residence, Sand Dune Stabilisation banner

Client:                      Private
Location:                Karekare Beach, Auckland
Project Value:       Undisclosed
Sector: Residential, 3 Waters
Completion:          2021

PROJECT DESCRIPTION

A steep site (30-35°) on sand does not typically constitute a viable building site.  The challenge was to determine a suitable foundation system for the site which included depths of loose sand in the order of 10 m in places.

GWE carried out a series of hand auger and machine drilled boreholes in conjunction with detailed slope stability analysis to inform foundation and slope stabilization design.  A deep foundation system with tie backs to provide adequate resistance against lateral loads was selected.  The resulting design was confirmed by the structural engineer implementing micropiles, up to 12 m long, that extended

into rock.  The design was externally peer reviewed and approved by Council prior to Building Consent being issued.

In addition to the micropile foundation/tie back system, continuously advanced and cemented retaining walls were constructed along the upslope of the development to protect the neighbouring property.

SERVICES PROVIDED

  • Geotechnical site investigation, on-site wastewater/ stormwater design and management.
  • Geotechnical design analysis to confirm stabilisation options.
  • Earthworks and micropile foundation and tieback installation supervision.
  • Geotechnical design checks during construction monitoring.
  • Coordination with designers site builder and micropile/tieback contractor.
GWE Consulting Engineers
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Karekare Beach Residence, Sand Dune Stabilisation

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Karekare Beach Residence, Sand Dune Stabilisation

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About the
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GWE Consulting Engineers is a well regarded, multi-disciplinary engineering consultancy operating throughout New Zealand.

The company provides geotechnical, civil and three waters’ (wastewater, stormwater and potable water) and environmental engineering services to governmental, industrial, commercial, developer and private clients.

We work in close association with leading architectural, surveying and project management firms as part of a larger design team providing thought leadership and innovative designs on major or groundbreaking projects.

GWE Consulting Engineers is committed to collaborating with our clients, design partners and regulators to deliver holistic solutions that endure beyond the life of the project.

Our services are consistent with sustainable practice, modern methods of construction and contemporary environmental objectives and deliver to our clients, economic and practical solutions. To understand more about our work, take a look at our experience