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Perth Link Road Geotechnical Services Tasmania

Perth Link Road Detailed Design-Geotechnical Services

Country: Australia

Project location within country: Perth – Tasmania

Name of client: VEC-SHAW Joint Venture

Stability assessment 13m high embankments with 1V:1.5 H batters over compressible clay soils

Professional staff provided: 12

Start date:

  • September 2018
  • Completion date:
  • Ongoing

Approx. value of services:

  • $ 1.2 million

Key personnel:

  • Ross Manning – Project Director
  • Austen Easterbrook – Technical Assurance, Lead Geotechnical Engineer
  • Andrew Tyson – Senior Engineering Geologist
  • Francesca Gorrini – Senior Engineering Geologist
  • Matthew Moore – Geotechnical Engineer
  • Vinay Trivedi – Senior Geotechnical Engineer
  • Ben Hart – Principal Bridge Foundation Engineer
  • Nathaniel Taylor – Senior Reinforced Soil Wall Design Engineer

The project provides a divided dual carriageway, approximately 4.7km in length, around the western side of Perth, connecting into Illawarra Road and joining up to the existing highway at the South Esk River Bridge. The scope of works includes 6 major bridges, with associated abutment retaining walls up to 12m high, fill embankments up to 13m high, and road cutting up-to 10m deep.

The scope of services undertaken by the geotechnical team, as an integrated discipline within the civil project design teams includes:

  • Tender Design for all bridges foundations, retaining walls, culverts and pavements
  • Planning and supervision of site investigations, factual reporting for site investigations;
  • Geotechnical interpretation, analysis and design as described below:
  • Embankment stability (Refer Figure 2) using Slope/W and settlement (SETTLE 3D) analysis. The stability analysis included plate load testing (Refer Figure 1) to optimise parameters for stability assessment resulting in 1.5H:1V batters up-to 13m high (Refer Figure 4).
  • Bridge foundations design to AS5100.3 including group analysis of piles driven in faulted material;
  • In-house RSS wall design (Refer Figure 3) including internal and external stability assessment to AS5100.3, and AS4678 to avoid using propriatry wall system;
  • Foundation assessment and ground improvement for culverts;
  • Inputs into bridge foundation design drawings to ensure foundations documentation meets geotechnical design intent;
  • Onsite design advice to the construction team to accommodate unforeseen ground conditions. Construction certification of bridge piles to VIC Roads Standards.

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