North Pier Half Moon Bay Marina

Auckland

Project Detail

This project involves the construction of a new Marina facility at the existing Half Moon Bay Marina:

  • Construction of 95 additional berths
  • An extension to the existing piled seawall
  • Construction of a new suspended car deck founded on piles
  • Dredging of new Marina area
  • A new travel lift for carrying boats into the maintenance area
  • New pavement areas for maintenance

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
  • Stability assessment of the new rockfill
  • Detailed design of the new deck piles
  • Detailed design of the pavement
  • Dredging effects assessment (geotechnical only)
  • Construction observations – geotechnical
Geotechnical risks and mitigation

RISKS

MITIGATION
Liquefaction susceptibility and global stability (lateral spread)
The site is underlain by reclamation fill overlying marine and a potentially liquefiable deposit. 		With targeted geotechnical investigation, and detailed liquefaction analyses we were able to demonstrate that liquefaction related effects could be largely controlled or mitigated without the need for ground improvement or an inground retaining wall.
Pile design
The geology at the site varies significantly with the depth to rock ranging from RL 0m to – 30.0m.		 By reviewing the pile set data in conjunction with the PDA testing, Initia was able to confirm that the loads required by the Structural Engineers were achieved at a shallower depth, leading to a cost saving in construction.

Client Referee
Neven Barbour, General Manager, Orams Group Ltd

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