Will Freelander, John Holland: Perth City Link
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Transcript of Will Freelander, John Holland: Perth City Link
![Page 1: Will Freelander, John Holland: Perth City Link](https://reader033.fdocuments.net/reader033/viewer/2022042714/555b7a95d8b42aae678b56aa/html5/thumbnails/1.jpg)
12th Australian Tunnelling Conference
21 – 22 November 2013
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The partners
• Perth City Link Rail Alliance project supported by Local, State and
Federal governments:
• $360 million project
• PTA will deliver the project’s first stages:
• Stage 1 (2011- 2014): sink 600 metre section of the Fremantle Line; build
a pedestrian underpass to connect Perth and Perth Underground stations;
and major upgrades to Perth Station
• Stage 2 (2014 - 2016): sink the Wellington Street Bus Station
underground
• MRA will manage the area’s planning and subdivision works, create the
new public spaces and facilitate private sector investment for the overall
Perth City Link project
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Rail project overview
• Sinking the Fremantle Line (William Street to Lake/King Street)
• New covered section of the Fremantle Line almost 600metres long
• Total work site exceeds 1.2km in length
• Improving connections between Perth Station and Perth Underground via a new pedestrian underpass
• By 2031, 22,600 people a day will use the new underpass
• Major upgrades to Perth Station, to meet Perth’s future public transport needs and special events.
• A new platform and track is being constructed, involving the extension of Barrack St Bridge
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January 2012
July 2011
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October 2013
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The vision - beyond 2016
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The facts
• 83,000 cubic metres of earth moved
• 53,000 cubic metres of concrete poured
• 3,400 metres of track laid
• 200km of cable installed (signals / communications and
power)
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BARRACK STREET
HORSESHOE BRIDGE
TUNNEL & DECLINES
PEDESTRIAN
UNDERPASS
CHILD CARE CENTRE
PERTH STATION
Key site areas
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Engineering and design challenges
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Building a tunnel over two existing tunnels
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Eastern Dive
Main Tunnel
Western Dive
Pedestrian Underpass
PUG LINK
Fremantle tunnel
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Fremantle and Joondalup Line tunnels
Fremantle
Line tunnel
Joondalup Line
bored tunnels
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Staged construction to maintain operating train
station
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Operating in a live rail environment
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Heritage-listed structures and nearby buildings
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Relocating Horseshoe Bridge Pier
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Piling in Childcare Centre playground
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Dewatering tanks
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Instrumentation and monitoring
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Located on old Lake Kingsford
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Site location - logistics
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Proactive approach to community relations
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WESTERN DECLINE
MAIN TUNNEL
EASTERN DECLINE
Perth-Fremantle tunnel
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Main tunnel
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D-wall excavation
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Pre-cast roof planks
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Topping slab
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Insitu base slab
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Western decline
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Eastern decline
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Tunnel excavation
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Fremantle Line tunnel – rail track
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Construct Diaphragm
Walls
Initial Bulk Excavation Construct Roof Slab
Partial Excavation
Complete Bulk Excavation
/ Dewatering
Construct Base Slab
Lateral Earth Pressures
RL 8.9 (Nom.)
Construction sequence
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3D plaxis modeling
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Joondalup and Fremantle Line tunnel interface
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MAIN TUNNEL
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Key design considerations
Proximity to existing tunnels
• current state of tunnel
• cracking of segment linings
• leaks at segment joints and bolt pockets
• Effects of construction on existing defects
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Key design considerations
Groundwater control
• Tunnel heave
• Release of overburden pressure
• Buoyancy due to high groundwater level
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Key design considerations
Stabilisation of diaphragm wall
toe
Primary support
Diaphragm wall panels
Prestressed Hanger
Beam
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CSM – grouted base
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Key design considerations
Soil movement minimisation
• Minimisation of soil pressure relief
• Increased diaphragm wall
stiffness
• Grout-mix base restraint to
diaphragm walls
• Staging of base slab excavation /
construction
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Advantages of adopted solution
Simplicity of construction
Staged construction
• Facilitates progressive monitoring
• Allows ongoing benchmarking of theoretical results
• Allowed continuous assessment of impact
• Provided avenue for continuous input from design
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Tunnel – western decline
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Key design issues
Future above-ground developments
• Magnitude of applied loads
• Restrictions on allowable tunnel movements
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5.1 MN 12.6 MN 15.2 MN 12.6 MN
Continuous 600
Diaphragm Wall 1200 / 1050 Dia.
Piles
Existing Sheet piling
40 / 30kPa 40 / 30kPa 40 / 30kPa
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Staged construction
• Screening to existing decline structure
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Construction sequence – stage 1
600 Continuous
Diaphragm Wall
1200 / 1050
Dia. Piles
Piles
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Construction sequence – stage 2
Construct Base
Slab
Excavate to a
maximum of 4.2m
Full depth
excavation within
Dive Structure
Construct Buttress
& Infill Walls
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Construction sequence – stage 3
Construct Roof Slab
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Construction sequence – stage 4
Complete Bulk
Excavation
Pour Bus Ramp
Base Slab
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Construction sequence – stage 5
Commission Tunnel &
Dive Structures
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Construction sequence – stage 6
Install Piles
adjacent existing
Decline Structure
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Construction sequence – stage 7 Construct Roof
Slab over Perth-
Butler Decline
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Pedestrian underpass
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Pedestrian underpass layout
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Pedestrian underpass
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Key design considerations
• Distance to operating train
station
• Maintain pedestrian movements
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Key design considerations
Top down construction
• Minimise required number of
shutdowns
• Delayed commencement of
stage 1 tunnel works
• Temporary strutting of contiguous
piled walls
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Underpass structure
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Underpass structure
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Underpass structure
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Perth Station underpinning
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Micro-piling underneath Perth Station
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Underpinning beams
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Perth Station underpinning
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Questions?