ST HELENA TUNNEL T2E Pacific Highway Upgrade From Tintenbar to Ewingsdale
12th AUSTRALIAN TUNNELLING CONFERENCE 2013 Presented by: Albrecht Mueller
St Helena Tunnel T2E
CONTENTS
1. Project Overview 2. Progress 3. Geology 4. Excavation and Temporary Support 5. Permanent Support 6. Waterproofing
T2E St Helena Tunnel
Project Overview
St Helena Tunnel T2E
Project Location 4
St Helena Tunnel T2E Project Key Data
16.3km of Dual Carriageway
10km of Access Roads
9 Bridge Structures / 3 Underpasses / 2 Culverts
3,200,000 m3 Bulk Earthworks
434m long tunnel through St Helena Hill
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St Helena Tunnel T2E
Location of St Helena Tunnel 6
Existing Highway
South Portal
North Portal
Upgraded Highway
St Helena Road
St Helena Tunnel T2E
View from St Helena Hill to Byron Bay 7
Existing Highway
Byron Bay
St Helena Tunnel T2E Tunnel Key Data
Road tunnel: 2 tubes 3 lanes each (future consideration)
Length of tunnels: 2 x 434m
Cut and Cover Sections at each end 2 x 39m
Spacing of egress cross passages: 120m
Area of tunnel cross section: 210m2
Excavated volume: 150,000m3
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St Helena Tunnel T2E
Tunnel Cross Section: Size Compared to Previous Projects 9
M5 East (55 m2)
CLEM 7 (120 m2)
St Helena (210 m2)
St Helena Tunnel T2E
Progress
St Helena Tunnel T2E
Tunnel Progress: Heading 11
South Portal
North Portal
St Helena Tunnel T2E
Northbound Tunnel from South: Heading and Bench Excavation 12
St Helena Tunnel T2E
Tunnel Control Centre: Excavation for Deluge Tanks 13
St Helena Tunnel T2E
Assembly of Tunnel Formwork 14
St Helena Tunnel T2E
Geology
St Helena Tunnel T2E
Regional Geology: Typical Basalt Columns (Fingal Heads) 16
St Helena Tunnel T2E
Regional Geology: Typical Basalt Columns (Byron Bay Quarry) 17
St Helena Tunnel T2E
Tunnel Geology: Long Section, Northbound Tube 18
Deep Zone of Extreme Weathering
Altered, Formerly Weathered Zones and
Deposits
Basalt
St Helena Tunnel T2E
Tunnel Geology: Cross Sections 19
South and Central Section North Section
St Helena Tunnel T2E
Tunnel Geology: Basalt Layers, South 20
St Helena Tunnel T2E
Tunnel Geology: Basalt Layers, South 21
St Helena Tunnel T2E
Tunnel Geology: Weathered Rock over Basalt Layers, North 22
St Helena Tunnel T2E
Excavation and Temporary Support
St Helena Tunnel T2E
Drill and Blast: Charged Face 24
St Helena Tunnel T2E
Drill and Blast: Blast 25
St Helena Tunnel T2E
Drill and Blast: Muck Pile 26
St Helena Tunnel T2E
Excavator / Rock Hammer 27
St Helena Tunnel T2E
Temporary Support: Support Types 28
St Helena Tunnel T2E
Temporary Support: Support Type Selection 29
St Helena Tunnel T2E
Temporary Support: Rock Bolts 30
St Helena Tunnel T2E
Temporary Support: Shotcrete 31
St Helena Tunnel T2E
Temporary Support: Lattice Girders 32
St Helena Tunnel T2E
Temporary Support: Spiling Bars 33
St Helena Tunnel T2E
Temporary Support: Face Nails 34
St Helena Tunnel T2E
Permanent Support
St Helena Tunnel T2E
Permanent Lining: View from Northern Portal 36
St Helena Tunnel T2E
Permanent Lining: 500 – 800 mm Cast in Situ Concrete 37
St Helena Tunnel T2E
Permanent Lining Reinforcement (Not T2E) 38
St Helena Tunnel T2E
Permanent Lining Formwork (Not T2E) 39
St Helena Tunnel T2E
Final Lining: Completed Tunnel 40
St Helena Tunnel T2E
Waterproofing
St Helena Tunnel T2E
Tunnel Hydrogeology: Long Section, Northbound Tube 42
Upper Water Level
Lower Water Level
T2E St Helena Tunnel
Spring Feeding a Dam at the Northern Portal 43
Spring
T2E St Helena Tunnel
Water Inflows during Excavation 44
T2E St Helena Tunnel
Waterproofing: Waterproofing Membrane (not T2E) 45
T2E St Helena Tunnel
Thank you for your attention.
Any Questions?
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T2E St Helena Tunnel