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Eglinton Crosstown - Perseverance Gets the Job Done..... Eventually

14th Annual Australian Tunnelling Conference

October 12, 2016

History

‒ 1985 -Rapid transit on Eglinton Avenue in Toronto was first proposed.

‒Nothing got built.

History

‒ 1991 - The Rapid Transit Expansion Program (RTEP) was announced

‒ 1994 - Construction started on a subway on EglintonAvenue

‒ 1995 - A change in provincial government resulted in the Eglinton Subway being cancelled.

History

‒ 1995 - The Rapid Transit Expansion Program reduced to the Sheppard Subway.

‒ 2005 - It got built.

History

‒ 2007 - Transit City was announced by the City. It included a 43 stop LRT line mostly on Eglinton Avenue.

‒ 2010 - A new city mayor Rob Ford was elected and immediately cancelled Transit City. Instead he wanted to expand the subway system.

‒ 2010 - Hatch was awarded the design contract by the TTC for a 19 km, all underground Eglinton-Scarborough Crosstown LRT.

History

‒ 2012 - Council overruled the mayor’s “all subway” plan and approved the go ahead of Eglinton LRT line. It was determined that the narrow right-of-way along Eglintonwould require that the LRT would be underground.

‒ Early contracts had already been awarded for the TBM launch shaft and for the procurement of the TBMs and the tunnel linings

Hatch Initial Involvement

‒ Prepare the Project Implementation Plan

Project Implementation Plan

‒ Context ‒ Project now administered by Metrolinx instead of TTC

‒ Four Lovat (Caterpillar) TBMs ordered May 2010, delivery July 2012 and Jan 2013

‒ Precast Concrete Lining contract awarded March 2011

‒ Twin Tunnels design contract October 2010

‒ LRV fleet ordered from Bombardier – deliveries beginning 2015

‒ ECLRT to be completely underground from at least Keele to Kennedy. 19 km

‒ Completion date 2020

Methodology – How and Why

‒ Methodology premised on achieving the earliest delivery of project .

‒ Schedule based on completing tunnel drives as early as possible since these constrain station and systems installation. (Too late for station boxes-before-tunnels)

‒ Additional TBMs (four) for a total of eight will be acquired as needed to optimize the schedule

‒ TBM launch sites will be selected based on efficiency and available undeveloped space. TBM optimum drive length determined to be approx. 3 km.

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Scope Adjustment

‒Underground portion reduced to 10 km‒West end elevated guideway 1 km‒East portion on street 8 km‒No need for the additional TBMs

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Adjusted Alignment Overview

• 25 km �10 km underground

�8 km at-grade

�1 km elevated

�6km SRT conversion

• 12 Underground Stations• 12 Surface Stops

Tunnelling Contract Breakdown

‒Two Sections Selected, West and East‒ Separated by the crossing of N-S subway and an interchange station

‒West Section - Keele to Yonge:‒ Two pairs of drives, 3.55 km and 2.71 km, progressing west to east

‒ Drives separated by the crossing of N-S subway and an interchange station

‒ Two TBMs supplied for the contractor’s use

‒ Launch shaft constructed as an advanced separate contract

‒East Section - Yonge to Don Mills‒ One pair of drives, 3.25 km progressing east to west

‒ Two TBMs supplied for the contractor’s use

‒ Launch shaft construction part of tunnelling contract

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Tunnel Drive Sequence:

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Tunnel Drive Sequence:

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Tunnel Drive Sequence: Headwalls

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Headwalls by Secant PilingTypical Installation Stages

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Headwalls by Jet GroutingTypical Installation Stages

Tunnel Drive Sequence

Install Jet Grout Block “Headwalls” from Surface


Install Station Sidewall and Headwall Support of Excavation


Excavation Station and Commence Removing PCTL


Station Box Fully Excavated

Tunnel Construction Scope

‒West Contract – Design/Bid/Build‒ Twin tunnels from West Launch Shaft to Yonge Station

‒ East Contract – Design/Bid/Build‒ Twin tunnels from Don Mills to Yonge

‒ Associated launch and removal shafts, except West Launch Shaft

‒ Emergency Exit Building and Cross Passages‒Headwalls or jet grouted block for support of excavation at each end of stations

West Alignment – Keele to Eglinton West

West Alignment –Eglinton West to Yonge

East Alignment – Yonge to Laird

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Tunnel Boring Machine (TBM)

‒ Four Earth Pressure Balance TBMs have been procured by Metrolinx

‒Direct contract by Metrolinx and free issue to contractor

West Stratigraphic Profile 106+300 to 107+00

Keele Station


Chaplin Station


Avenue Station

East Stratigraphic Profile 113+820 to 114+400

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East Stratigraphic Profile 114+400 to 115+080

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Stratigraphic Profile 115+080 to 115+760

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CP13 and Jet Grout Headwalls:Stratigraphic Profile Station 115+760 to 116+440

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EEB4: Stratigraphic Profile Station 116+440 to 117+120

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Typical Structures

Prediction of Tunnelling Settlement

Typical Tunnelling Settlement Profile

EB TUNNEL

Typical Tunnelling Settlement Profile

EB TUNNEL

WB TUNNEL

Combined Settlement Contours

Structural Inventory

Level 1 Impact Methodology

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Half Trough Width (m)

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Building Slope

Typical

Building

Maximum Slope

Building Impact Inventory Sheet

Level 1 Impact Results

Moderate to Severe damage assessment levels perform Level 2 detailed assessment

Level 1 Impact Results

Level 1 building impact assessment graph (from Boscardin & Cording)

Level 2 Analysis

Obstructions to Tunnelling Tieback Anchors

‒Tieback Obstruction Concern:‒ 1500+ buildings along ECLRT Keele to BrentcliffeAlignment

‒Multi storey buildings ranging from 1-30+ ‒Multi storey basements ranging from 1-5 ‒Building offset from ESC TT Reference Line ranges from 10-30 m

‒Sources of Information:‒ Isherwood Geostructural Engineers‒ Excavation Support Record Drawings‒Basement Study

Obstructions to Tunnelling Isherwood Study

Obstructions to Tunnelling Critical Tieback Anchors

989 Eglinton Ave. W212 Eglinton Ave. E

�Tieback anchors confirmed from record dwgs�5 known instances, impact to TBM�Recommended to lower profile by 5 m

�Presence of tieback anchors assumed �Conservative assumptions were made to generate tieback obstructions�Assessment based on probability of a tieback at building, tieback configuration, impact to TBM mining location and adverse cost impact to station and EEBs�Recommended to maintain profile

Feb 16, 11 Alignment

Jun 23, 11 Alignment

Obstructions to Tunnelling Piles at the East Tail Track Structure

‒ Structure part of the Eglinton West Subway Project (1995)

‒ SOE piles were partial installed for the east tail track structure

‒ Approximately 14 piles are recommended to be removed

‒ Sources of Information‒ Isherwood Geostructural Engineers

‒ Ground Penetrating Radar (GPR) by TSH

‒ Additional GPR in progress by SPL

Portion of Piles to be Removed

Piles Potentially in Conflict with LS-2

Contract Procurement

‒TBMs procured by owner based on specifications by Hatch

‒Tunnel linings procured by owner based on design and specifications by Hatch

‒Advance contract for launch shaft‒Mostly to improve schedule for tunnels‒Innovations on TBMS

‒Grouting through tail with 2 component grout‒Bentonite injection around shield‒ Inflatable emergency tail seals

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Contract Procurement

‒Infrastructure Ontario was encouraging the use of alternative procurement methods

‒However, the tunnel procurement was at an advanced stage when Metrolinx took over from TTC

‒Therefore the two tunnel contracts (west and east) were procured by design-bid-build‒ Seven bidders for West Contract (February 2013)

‒ Low bidder was Obayashi/Kenaiden/Kenny at $283M‒ Three bidders for East Contract (November 2013)

‒ Low bidder was Aecon/Dragados at $177M

‒The remainder of work to be P3 procured

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Reference Design for P3

‒All twelve underground stations. Six already designed.

‒All surface alignment, twelve stops etc‒Elevated alignment over Black Creek Drive‒Maintenance and Storage Facility.‒All rail systems.

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Mount Dennis Station

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Kodak Building

The P3 Contract

‒Won by a joint venture of SNC-Lavalin, AECON, ACS Infrastructure and EllisDon in November 2015.

‒Total value $9.1Billion‒Includes maintenance of the facilities and vehicles for 30 years.

‒Completion by 2021

West Launch Shaft Rendering

‒Install

Source: thecrosstown.ca

60m long, 20m wide and 16m deep

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Tunnel Daily Report

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Tunnel Daily Report

Observed Maximum Settlement

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Settlement (m

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Eastbound Tunnel Maximum Settlement

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Westbound Tunnel Maximum Settlement

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Questions

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