Orams Marine Re-development

Wynyard Quarter, Auckland CBD

Project Detail

This project involves the re-development of the existing Orams Marine facility at Wynyard Quarter with the following new marine facilities:

  • Strengthening of the existing seawall involving construction of reinforced concrete barrettes, tied back to a deadman beam
  • Installation of new sheetpile walls in front of the strengthened seawall
  • Construction of a new 40 m length of seawall
  • Construction of three new piers extending into the harbour; two 60 m long and one 30 m long. The longer piers are designed for trafficking of a marine travel lift carrying up to 800t vessels out of the water
  • Dredging of the marina to accommodate super yachts up to 800t
  • New heavy-duty pavement for land-based trafficking of the marine travel lift (370t wheel set loads)
  • New hangar buildings for maintenance of superyachts
  • Commercial buildings supported on piled foundations
  • Installation of a groundwater cut-off barrier

Estimated Project Value: $50-70M

Initia's involvement

Our involvement in this project has comprised the following:

  • Geotechnical investigations
  • Liquefaction analyses and global stability assessment of the site
  • Detailed design of the strengthened seawall and new sheet pile wall
  • Detailed design of the new seawall
  • Dredging effects assessment (geotechnical only)
  • Subgrade ground improvement design for the heavy duty pavement involving ex-situ lime and cement stabilisation of the highly contaminated subsoils
  • Geotechnical design of new pile foundations to support the piers and new building structures
  • Preparation of earthworks and ground improvement specifications
  • Technical reviews of construction tenders
  • Construction observations and validation testing – geotechnical and civil works
Geotechnical risks and mitigation
RISKS MITIGATION
Liquefaction susceptibility and global stability (lateral spread)
The site is underlain by sandy reclamation fill overlying marine and alluvial deposits with liquefaction susceptibility.		 With targeted geotechnical investigation, and detailed liquefaction analyses we were able to demonstrate that liquefaction related effects could be largely controlled or mitigated. The length of strengthened seawall and new length of seawall has been designed to adequately mitigate the risk of global instability or lateral spread following a seismic event.
Pavement design
Low strength, completely saturated subgrade conditions are present at the pavement design level. The marine travel lift has 370t wheelset loadings with peak wheel pressures of 1 MPa (approximately twice the wheel load of a fully loaded A380 Aircraft).		 Specialised, supplementary geotechnical investigations and analyses were undertaken to deliver a significantly refined pavement design resulting in a 50% reduction in pavement thickness and reduced excavation depth. Ex-situ stabilisation of highly contaminated soils was undertaken in lieu of exporting materials to a licensed landfill and importing quarry grade subbase and basecourse materials. The subgrade improvement works are approximately 70% complete and validation testing has confirmed it is meeting or exceeding required design criteria

Client Referee
Neven Barbour, General Manager, Orams Group Ltd

Next Project >