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Legacy Way ProjectPresentation to IoM3 – Hong Kong Branch - 27 March 2013

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Outline• Project overview• Geology and geotechnical issues• Tunnelling• SFRC segments • Cross passages • Progress to date• Concluding remarks• Q & A

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Outline• Project overview• Geology and geotechnical issues• Tunnelling• SFRC segments • Cross passages • Progress to date• Concluding remarks• Q & A

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Contract between TRANSCITY and the three designers to deliver the D&C design, Design Certification and As-Constructed Certification

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Project Overview

• AUD $1.8bn D & C contract let in September 2010, to be complete by 2015

• two-lane TBM PCC segment lined rock tunnels length = 4.3kmeach

• 36No. XPs every 120m, 4No. substations and sump/pump station.• grades at 3% except for the Eastern end where the grade rises to

5%.

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• TBM Annabell• TBM Joyce

Double shield rock TBMs

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Outline• Project overview• Geology and geotechnical• Tunnelling• SFRC segments• Cross passages • Progress to date• Concluding remarks• Q & A

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Bunya Phyllite Neranleigh-Fernvale Beds

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0.0

5.0

10.0

15.0

20.0

25.0

30.0

35.0

40.0

45.0

50.0

20 30 40 50 60 70 80 90 100

foliation angle (deg)

UC

S_es

t (M

Pa)

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BPY phyllite-hornfels-quartzite (FR)

0.00

5.00

10.00

15.00

20.00

25.00

30.00

0 - 2

2 - 4

4 - 6

6 - 8

8 - 10

10 - 1

212

- 14

14 - 1

616

- 18

18 - 2

020

- 22

22 - 2

424

- 26

26 - 2

828

- 30

30 - 3

2

Is50 MPa

Freq

uenc

y %

e.g. NFBGreywacke

UCS_ave(MPa)

UCS_k(MPa)

FR 5.35 4.28

SW 2.05 1.64

DW 1.83 1.46

0

2

4

6

8

10

12

14

1 2 3 4 5 6 7 8 9 10 11 12 13 14

depth class (m)

frequ

ency

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Weathering

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Rock structure

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In situ stress

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Outline• Project overview• Geology and geotechnical issues• Tunnelling• SFRC segments• Cross passages • Progress to date• Concluding remarks• Q & A

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Verti

cal d

ispl

. (m

m)

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Trackless wagon transport

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Outline• Project overview• Geology and geotechnical issues• Tunnelling• SFRC segments • Cross passages • Progress to date• Concluding remarks• Q & A

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SFRC Segments

• 12.0 m Outside diameter• 11.3m internal diameter• Ring internal dia. / thickness = 32 • Segment span / thickness = 12• 8 + 1 universal ring• 2.0 m wide

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Segment quality control

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Outline• Project overview• Geology and geotechnical issues• Tunnelling• SFRC segments • Cross passages • Progress to date• Concluding remarks• Q & A

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Cross Passages

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Substation openings

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Outline• Project overview• Geology and geotechnical issues• The tunnelling process• SFRC segment design • Cross passages • Progress to date• Concluding remarks• Q & A

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Tunnelling progress

• TBMs Annabell and Joyce are expected to breakthrough in the next 2 to 3 months

• Both TBMs at approximately ch.3km – Joyce approx. 100m in advance of Annabell

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Spoil disposal

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Mt Coot-thaQuarry

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Outline• Project overview• Geology and geotechnical issues• The tunnelling process• SFRC segment design • Cross passages • Progress to date• Concluding remarks• Q & A

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Concluding remarksKey points to high advance rates to date:

• Good geotechnical understanding and probabilistic assessment of ground risk

• Good stand-up time, low water inflows - double-shield can realise full potential

• Staggered grouting & innovative design including circumferential joint dowels

• High segment production rate (rebar fixing minimised)• Minimising steel in segments – 350mm SFRC can be safely

handled• Effective high-volume spoil removal system• Trackless materials transport in the tunnels• Frame-less XP openings minimise obstruction

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