Sydney Metro – Central Walk


The Sydney Metro Central Station Main Works (CSM) - Central Walk contract includes the following works:

  • Stage 1; The Central Walk Advanced Adit – construction of an 82m long tunnel with four shafts connecting the adit to surface Platforms 16-23. The purpose of the four shafts is to allow the existing rail corridors to continue operating during the construction of the Central Walk and the Station Main Works.
  • Stage 2; Excavation and construction of the new underground metro box and the retrofitting of Platforms at Central Station beneath Platforms 13 and 23.
  • Stage 3; Excavation of a Central Walk, a new 19m wide underground pedestrian concourse from Chalmers Street, connecting commuters to suburban rail platforms, Sydney Metro platforms, the new light rail and buses.


Sydney Metro – Central Walk


Laing O’Rourke


Sydney, Australia

Time Frame

2019 – 2022


$955 million


Stage 1 and 2:

JDK’s applied their exemplary systematic capture of geotechnical and geological information and world-class expertise to deliver the following project aspects:

    • Permit to Tunnel (PTT) review and implementation to ensure design compliance and management through multiple stakeholders.
    • Geotechnical assessment of roof conditions and bearing capacity design
    • Rockfall remediation and prevention
    • Geological defect mapping, monitoring and remediation
    • Geotechnical assessment and confirmation of ground conditions for support type design compliance
    • Permit to excavate (PTE) and permit to trench (PTT) through ground conditions with high defect and at times weak rock mass
    • Inspection of weight-bearing structures through the excavation of shale, sandstone and soft landfill zones
    • Ground bearing capacity design
    • Final lining review & crack mapping/remediation

Stage 3:

    • Creation and implementation of a project production database to track the schedule against the budget
    • Project design compliance set forth by our quality management review principals.
    • Daily, weekly and monthly reporting methodology for optimised communication of project outcomes and recommendations.
    • Temporary design implementation: interaction and management between project set requirements (as directed by the client) and the temporary work designs

Value Added to the Project

JDK’s professional interaction with stakeholders, extensive geotechnical expertise and interpretation of the methodology used to manage and control tunnelling risk proved highly successful. The implementation of monitoring controls was completed without any community complaints, client issues or damage to existing infrastructure. The JDK team employed innovative data collection methods leading to improved data quality. 

JDK completed all work safely, within budget and on time while meeting the requirements of the design of the contract. Our precise inferences of ground conditions allowed the client to deliver to their schedule and utilise their resources efficiently.

Project Highlights