Auckland City Rail Link Tunnelling Challenges. Tom Ireland
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1 Auckland City Rail Link Tunnelling Challenges Tom Ireland
2 Outline Project description Geological and Hydrogeological Conditions Cut and cover tunnels beneath existing Britomart Station Y-Junction Mined Caverns Tunneling underneath a Historical Building Works Contracts and Procurement Summary Conclusion
3 Auckland Population Around 1.5 M today Projected to reach 2 M around % of New Zealand s population growth
4 City Rail Link Project
5 City Rail Link (CRL) Vertical Alignment
6
7 Economic Development in the CRL Corridor
8 Aotea Station
9 Aotea Station
10 Karangahape Station
11 Geological and Hydrogeological Conditions
12 Geological and Hydrogeological Conditions
13 Britomart Transport Centre
14 Britomart Transport Centre Today
15 Britomart Transport Centre 3-D model
16 Britomart Transport Centre works required
17 Britomart Detailed Design
18 Temporary Entrance
19 Low headroom Hydrofraise
20 BIM BTC
21 Diaphragm and Jet Grout Cut off Walls
22 Y-Junction Caverns Down Main Y-junction Up Main Y-junction Small Medium Large Small Medium Large Length (m) Span (m) Height (m)
23 Y-Junction Caverns - Geology
24 Y-Junction Caverns Temp Works Cavern Excavation stages Initial Support Large cavern 18.5m span Heading: 3 stages 350mm thk SFRS + lattice 1m spacing (both Y-junctions) Bench: 3 stages 350mm thk SFRS + lattice 1m spacing Medium cavern 14m span (both Y-junctions) Small cavern 11m span (MC20/MC50 Y-junctions) Small cavern 11m span (MC30/MC60 Y-junctions) Invert: 1 stage Heading: 2 stages Bench: 1 stage Heading: 1 stage Bench: 1 stage Heading: 1 stage Bench: 1 stage 200mm thk SFRS 250mm thk SFRS + lattice 1m spacing 150mm thk SFRS 200mm thk SFRS + lattice 1m spacing 100mm thk SFRS 200mm thk SFRS + 3m long rock 1.2 c/c 100mm thk SFRS
25 MC30/MC60 Junction Construction Sequence
26 MC30/MC60 Junction Construction Sequence
27 MC30/MC60 Junction Construction Sequence
28 MC30/MC60 Junction Construction Sequence
29 MC30/MC60 Junction Construction Sequence
30 MC30/MC60 Junction Construction Sequence
31 MC30/MC60 Junction Construction Sequence
32 MC30/MC60 Junction Construction Sequence
33 MC30/MC60 Junction Construction Sequence
34 MC20/MC50 Junction Temp TBM Tunnel & Removal
35 Tunnelling underneath Historical Building
36 Tunnelling underneath Historical Building Settlement Analysis and Building Assessment Mercury Theatre Settlement Contour
37 Tunnelling underneath Historical Building Settlement Analysis and Building Assessment
38 Tunnelling underneath Historical Building Settlement Analysis and Building Assessment
39 Works Contracts and Procurement Works Contract Key Procurement Dates Express of Interests (EOI) Request for Proposals (RFP) C1: Britomart N/A N/A C2: Lower Albert Street N/A N/A C3: Station and Tunnels Prequal Jan 2017/ EOI Apr 2017 Q C5: Western Line Q Q C6: Mt Eden Stormwater Diversion N/A TBA C7: Systems Integration, Testing & Commissioning Jan 2017 Apr 2017 C8: Wider Network Improvements TBA TBA C9: Britomart East TBA: post construction of main works
40 Conclusions The CRL tunnels, consisting of TBM tunnels, mined SEM tunnels and deep shaft excavations, will be constructed within Auckland CBD, where mixed ground conditions, sensitive buildings/ structures, and clashes with existing utilities add significant complexity to the design and construction The most complex part of the project involves excavating cut and cover tunnels beneath the existing 100 year old heritage Central Post Office. Innovative design and construction techniques are required to deal with the complex constraints A robust tunnel design and construction arrangement to minimize the tunnelling risks have been considered and documented in the reference design stage to provide a sound technical basis for procurement of the detailed design and construction Contract 3
41 Acknowledgements City Rail Link Limited for permission to publish this paper Co-authors : Steve Hawkins of City Rail Link Limited Bill Newns, Shu Fan Chau of Aurecon, NZ Principal Technical Advisor Partners: Mott Macdonald Jasmax Architects Grimshaw Architects ARUP
42 Questions?
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