Transcript
PM-OP-TE-0015
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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