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Will Freelander, John Holland: Perth City Link
Will Freelander, John Holland: Perth City Link
Will Freelander, John Holland: Perth City Link
Will Freelander, John Holland: Perth City Link
Will Freelander, John Holland: Perth City Link
Will Freelander, John Holland: Perth City Link
Will Freelander, John Holland: Perth City Link
Will Freelander, John Holland: Perth City Link
Will Freelander, John Holland: Perth City Link
Will Freelander, John Holland: Perth City Link
Will Freelander, John Holland: Perth City Link
Will Freelander, John Holland: Perth City Link
Will Freelander, John Holland: Perth City Link
Will Freelander, John Holland: Perth City Link
Will Freelander, John Holland: Perth City Link
Will Freelander, John Holland: Perth City Link
Will Freelander, John Holland: Perth City Link
Will Freelander, John Holland: Perth City Link
Will Freelander, John Holland: Perth City Link
Will Freelander, John Holland: Perth City Link
Will Freelander, John Holland: Perth City Link
Will Freelander, John Holland: Perth City Link
Will Freelander, John Holland: Perth City Link
Will Freelander, John Holland: Perth City Link
Will Freelander, John Holland: Perth City Link
Will Freelander, John Holland: Perth City Link
Will Freelander, John Holland: Perth City Link
Will Freelander, John Holland: Perth City Link
Will Freelander, John Holland: Perth City Link
Will Freelander, John Holland: Perth City Link
Will Freelander, John Holland: Perth City Link
Will Freelander, John Holland: Perth City Link
Will Freelander, John Holland: Perth City Link
Will Freelander, John Holland: Perth City Link
Will Freelander, John Holland: Perth City Link
Will Freelander, John Holland: Perth City Link
Will Freelander, John Holland: Perth City Link
Will Freelander, John Holland: Perth City Link
Will Freelander, John Holland: Perth City Link
Will Freelander, John Holland: Perth City Link
Will Freelander, John Holland: Perth City Link
Will Freelander, John Holland: Perth City Link
Will Freelander, John Holland: Perth City Link
Will Freelander, John Holland: Perth City Link
Will Freelander, John Holland: Perth City Link
Will Freelander, John Holland: Perth City Link
Will Freelander, John Holland: Perth City Link
Will Freelander, John Holland: Perth City Link
Will Freelander, John Holland: Perth City Link
Will Freelander, John Holland: Perth City Link
Will Freelander, John Holland: Perth City Link
Will Freelander, John Holland: Perth City Link
Will Freelander, John Holland: Perth City Link
Will Freelander, John Holland: Perth City Link
Will Freelander, John Holland: Perth City Link
Will Freelander, John Holland: Perth City Link
Will Freelander, John Holland: Perth City Link
Will Freelander, John Holland: Perth City Link
Will Freelander, John Holland: Perth City Link
Will Freelander, John Holland: Perth City Link
Will Freelander, John Holland: Perth City Link
Will Freelander, John Holland: Perth City Link
Will Freelander, John Holland: Perth City Link
Will Freelander, John Holland: Perth City Link
Will Freelander, John Holland: Perth City Link
Will Freelander, John Holland: Perth City Link
Will Freelander, John Holland: Perth City Link
Will Freelander, John Holland: Perth City Link
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Will Freelander, John Holland: Perth City Link

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Will Freelander, Perth City Link – Section Manager, John Holland delivered this presentation at the 2013 Australian Tunnelling conference. The two day conference is supported by the Australasian …

Will Freelander, Perth City Link – Section Manager, John Holland delivered this presentation at the 2013 Australian Tunnelling conference. The two day conference is supported by the Australasian Tunnelling Society and brings together tunnelling leaders, engineers and industry experts to share best practice in tunnelling design, construction, safety and maintenance.

The 2012 program focussed on updates from Australasia’s current and future projects, plus case studies from leading International projects - sharing best practice and lessons learnt from the forefront of the latest tunnelling projects. For more information about the event, please visit the conference website: http://www.informa.com.au/tunnellingconference

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Transcript

  • 1. 12th Australian Tunnelling Conference 21 – 22 November 2013
  • 2. The partners • Perth City Link Rail Alliance project supported by Local, State and Federal governments: • $360 million project • PTA will deliver the project’s first stages: • Stage 1 (2011- 2014): sink 600 metre section of the Fremantle Line; build a pedestrian underpass to connect Perth and Perth Underground stations; and major upgrades to Perth Station • Stage 2 (2014 - 2016): sink the Wellington Street Bus Station underground • MRA will manage the area’s planning and subdivision works, create the new public spaces and facilitate private sector investment for the overall Perth City Link project
  • 3. Rail project overview • Sinking the Fremantle Line (William Street to Lake/King Street) • New covered section of the Fremantle Line almost 600metres long • Total work site exceeds 1.2km in length • Improving connections between Perth Station and Perth Underground via a new pedestrian underpass • By 2031, 22,600 people a day will use the new underpass • Major upgrades to Perth Station, to meet Perth’s future public transport needs and special events. • A new platform and track is being constructed, involving the extension of Barrack St Bridge
  • 4. July 2011 January 2012
  • 5. October 2013
  • 6. The vision - beyond 2016
  • 7. The facts • 83,000 cubic metres of earth moved • 53,000 cubic metres of concrete poured • 3,400 metres of track laid • 200km of cable installed (signals / communications and power)
  • 8. Key site areas TUNNEL & DECLINES PEDESTRIAN UNDERPASS HORSESHOE BRIDGE PERTH STATION CHILD CARE CENTRE BARRACK STREET
  • 9. Engineering and design challenges
  • 10. Building a tunnel over two existing tunnels
  • 11. Fremantle tunnel Main Tunnel Eastern Dive Pedestrian Underpass Western Dive PUG LINK
  • 12. Fremantle and Joondalup Line tunnels Joondalup Line bored tunnels Fremantle Line tunnel
  • 13. Staged construction to maintain operating train station
  • 14. Operating in a live rail environment
  • 15. Heritage-listed structures and nearby buildings
  • 16. Relocating Horseshoe Bridge Pier
  • 17. Piling in Childcare Centre playground
  • 18. Dewatering tanks
  • 19. Instrumentation and monitoring
  • 20. Located on old Lake Kingsford
  • 21. Site location - logistics
  • 22. Proactive approach to community relations
  • 23. Perth-Fremantle tunnel MAIN TUNNEL WESTERN DECLINE EASTERN DECLINE
  • 24. Main tunnel
  • 25. D-wall excavation
  • 26. Pre-cast roof planks
  • 27. Topping slab
  • 28. Insitu base slab
  • 29. Western decline
  • 30. Eastern decline
  • 31. Tunnel excavation
  • 32. Fremantle Line tunnel – rail track
  • 33. Construction sequence Construct Roof Slab Initial Bulk Excavation RL 8.9 (Nom.) Partial Excavation Construct Base Slab Complete Bulk Excavation / Dewatering Construct Diaphragm Walls Lateral Earth Pressures
  • 34. 3D plaxis modeling
  • 35. Joondalup and Fremantle Line tunnel interface
  • 36. MAIN TUNNEL
  • 37. Key design considerations Proximity to existing tunnels • current state of tunnel • cracking of segment linings • leaks at segment joints and bolt pockets • Effects of construction on existing defects
  • 38. Key design considerations Groundwater control • Tunnel heave • Release of overburden pressure • Buoyancy due to high groundwater level
  • 39. Key design considerations Prestressed Hanger Beam Stabilisation of diaphragm wall toe Primary support Diaphragm wall panels
  • 40. CSM – grouted base
  • 41. Key design considerations Soil movement minimisation • Minimisation of soil pressure relief • Increased diaphragm wall stiffness • Grout-mix base restraint to diaphragm walls • Staging of base slab excavation / construction
  • 42. Advantages of adopted solution Simplicity of construction Staged construction • Facilitates progressive monitoring • Allows ongoing benchmarking of theoretical results • Allowed continuous assessment of impact • Provided avenue for continuous input from design
  • 43. Tunnel – western decline
  • 44. Key design issues Future above-ground developments • Magnitude of applied loads • Restrictions on allowable tunnel movements
  • 45. 5.1 MN 12.6 MN 40 / 30kPa Continuous 600 Diaphragm Wall 15.2 MN 40 / 30kPa 1200 / 1050 Dia. Piles 12.6 MN 40 / 30kPa Existing Sheet piling
  • 46. Staged construction • Screening to existing decline structure
  • 47. Construction sequence – stage 1 600 Continuous Diaphragm Wall Piles 1200 / 1050 Dia. Piles
  • 48. Construction sequence – stage 2 Construct Buttress & Infill Walls Excavate to a maximum of 4.2m Full depth excavation within Dive Structure Construct Base Slab
  • 49. Construction sequence – stage 3 Construct Roof Slab
  • 50. Construction sequence – stage 4 Complete Bulk Excavation Pour Bus Ramp Base Slab
  • 51. Construction sequence – stage 5 Commission Tunnel & Dive Structures
  • 52. Construction sequence – stage 6 Install Piles adjacent existing Decline Structure
  • 53. Construction sequence – stage 7 Construct Roof Slab over PerthButler Decline
  • 54. Pedestrian underpass
  • 55. Pedestrian underpass layout
  • 56. Pedestrian underpass
  • 57. Key design considerations • Distance to operating train station • Maintain pedestrian movements
  • 58. Key design considerations Top down construction • Minimise required number of shutdowns • Delayed commencement of stage 1 tunnel works • Temporary strutting of contiguous piled walls
  • 59. Underpass structure
  • 60. Underpass structure
  • 61. Underpass structure
  • 62. Perth Station underpinning
  • 63. Micro-piling underneath Perth Station
  • 64. Underpinning beams
  • 65. Perth Station underpinning
  • 66. Questions?

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