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Matthew Norbert, GHD: Design aspects for the Legacy Way road tunnel

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Matthew Norbert, Principal Tunnel Engineer, GHD delivered this presentation at the 2013 Australian Tunnelling conference. The two day conference is supported by the Australasian Tunnelling Society and …

Matthew Norbert, Principal Tunnel Engineer, GHD 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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  • 1. Design aspects of Legacy Way road tunnel Australian Tunnelling Conference - Presentation 21 November 2013 PM-OP-TE-0015
  • 2. Transcity Design Alliance Design Alliance formed between Transcity and the three designers to deliver the D&C design, Design Certification and As-Constructed Certification PM-OP-TE-0015
  • 3. TBM Launch considerations PM-OP-TE-0015
  • 4. TBM excavation starts adjacent to the shared user path. • • • • • 12.4 m excavated diameter. 10 m of overburden above the crown. Three shields total 20 m in length. First segmental ring installed once 20 m of tunnel has been excavated. Annulus grouted 25-28 m behind excavated face PM-OP-TE-0015
  • 5. Pipe umbrella Design Objectives: • Eliminate requirement for stub tunnel • Ensure impact upon surface infrastructure is minimised • Utilised available technology to form pre-support • Portal block provides stable platform for launch ring erection and retrain PM-OP-TE-0015
  • 6. Design requirements to be met: • Accurate drilling alignment • Annulus grouting of pipe • Secondary pipe at portal block long with structural concrete filling of pipe • Reinforced concrete portal block • Horizontal anchors to restrain thrust from TBM on launch ring PM-OP-TE-0015
  • 7. PM-OP-TE-0015
  • 8. Thrust beam and steel launch ring PM-OP-TE-0015
  • 9. PM-OP-TE-0015
  • 10. Ground monitoring of TBM launch • Vertical inclinometers to detect horizontal movement. • Vertical extensometers to detect vertical movement. • Optical prisms on inside face excavation support. • Horizontal inclinometers in pipe umbrellas to detect movement into tunnel excavations. • Settlement points on and adjacent to the road. PM-OP-TE-0015
  • 11. Horizontal inclinometer - Joyce PM-OP-TE-0015
  • 12. Segment Breakout X Passage Design Objectives: • Eliminate or reduce external support to the cut rings • Provide a system that can be monitored and have practical trigger values • Provide a system that can withstands potential impacts from blasting PM-OP-TE-0015
  • 13. Segment Stabilisation PM-OP-TE-0015
  • 14. Confirmation of design assumptions PM-OP-TE-0015
  • 15. Segment accessories PM-OP-TE-0015
  • 16. X Passage and Sub station excavation Design requirements to be met: • Bar reinforced segments at openings • High performance double dowels between segments on circumferential joint • Temporary drainage holes provided through segments at breakout locations • Wider substation openings required additional beam to transfer load from cut rings to adjacent rings • Additional anchors installed where blasting undertaken adjacent to segments PM-OP-TE-0015
  • 17. Drill and Blast Excavation PM-OP-TE-0015
  • 18. Design Objectives: • Undertake a detailed assessment of allowable blast vibration limit on precast segments • Evaluate blast vibration on segments from practical close in blast pattern • Outline monitoring regime required to allow blasting option to be trailed and developed Design requirements to be met: • Maximum allowable PPV on segments based upon concrete tensile capacity • Perimeter drill hole pattern arranged to prevent direct blast loading from rock mass onto segments • Additional support to be installed to cut rings, not for design loads but as first response to potential segment joint movement triggers PM-OP-TE-0015
  • 19. Questions ? PM-OP-TE-0015