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Soft soil early work at Pimlico – Pacific Highway Upgrade – Woolgoolga to Ballina

Project Description –

On behalf of the Australian and NSW governments, Roads and Maritime Services is progressively upgrading the Pacific Highway to dual carriageway between the Hunter and NSW/Queensland border. The Woolgoolga to Ballina Pacific Highway upgrade involves the duplication of 155 kilometres to a four-lane divided road. The upgrade starts about six kilometres north of Woolgoolga (north of Coffs Harbour) and ends about six kilometres south of Ballina.

The soft soil early work at Pimlico is part of the Woolgoolga to Ballina Pacific Highway upgrade. SEE Civil worked collaboratively with Roads and Maritime Services and Pacific Complete to deliver this part of the Woolgoolga to Ballina Pacific Highway upgrade.

Our work included:

  • Foundation treatment across about 3.8 kilometres
  • Installation of about 320,000 metres of vertical wick drains
  • Installation of stormwater drainage
  • Foundation treatment using ab out 70,000 cubic metres of drainage rock
  • Construction of temporary pavements including an upgrade to the intersection at Whytes Lane and the Pacific Highway
  • Installation of specialised geotechnical instruments for settlement monitoring of soft soils, including vibrating wire, bored, nested and standing piezometers, inclinometers, settlement plate, data loggers and hydrostatic profile gauges
  • Importation of about 185,000 cubic metres of earth fill material
  • Earth reinforcement using geotextiles and geosynthetic reinforcement
  • Installation of HDPE drainage pipes due to the presence of soft soil zones
  • Management of acid sulfate and soft soil conditions of varying levels across the project area.

The soft soil early work was undertaken in this area to ensure the required settlement could be achieved before starting main civil work.


Quick Facts

  • Location - Pacific Highway Whytes Lane to Pimlico
  • Start Date - April 2015
  • Completion Date - July 2016
  • Value - $11M
  • Client - Roads & Maritime Services