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Highway 401 Crossing - Design

Service Performed
SEM tunnel design consisting of IFC drawings, specifications, 3D FE analysis and detailed design reports.
Commencement - Services
November 01, 2017
Completion - Services
January 01, 2019
Location
97 Front Street West
Toronto, ON ON MJ5 1E6
Canada
Geology description

Granular and cohesive embankment fill underlain by glacial till. Subsurface obstructions such as piles and boulders.

Geology types
Description

The TTP are delivering a new two track rail tunnel of approximately 176m length crossing the Highway 401. The purpose of the tracks is to increase capacity along the Kitchener GO commuter rail corridor as well as to accommodate the new Union-Pearson (UO) Express service. The new rail tunnels are mined under the 401/409 Highway using the Sequential Excavation Method (SEM). Our role on this assignment was to provide tunnel design services addressing the challenging conditions (e.g., very low overburden, intercepting piles and maximum settlement allowance) as well as providing on site design representation.

Activity
Construction methods
Tunneling under
3D Finite Element Model
Plan View
Project number
487D
Project Type
DSC
Final cost
$117 million CAD

Lima Metro Line 2

Service Performed
Investigation of unexpected progressing settlement of ground surface and constructed Metro Line 2 tunnel, shaft and station structures in Lima’s Santa Anita district.
Commencement - Services
March 01, 2014
Location
Av. Aviación 2494 – San Borja
Lima
Peru
Geology description

All Metro Line 2 structures in the Santa Anita district were constructed in dense gravels which is underlain by a sequence of clay, sand and gravel layers. The bedrock lies an assumed 30m to 150m below ground surface.

Geology types
Description

Lima's Metro Line 2 project comprises 27 km of all-underground Line 2, plus an 8 km underground spur to the airport which will make up the first section of Line 4. Thirty-five new stations are being constructed, seven of them mined and the rest constructed by cut and cover. The MDL2 consortium is to design, finance and build the new line and to operate and maintain it for the following 30 years.

Activity
Construction methods
Overview of Lima's Metro Line 2 project (www.thinglink.com)
Results plot of the 2D finite element consolidation analysis
Project number
473C
Project Type
DSC
Final cost
$5.7 billion USD
Completion date
Ongoing

Walthamstow Central Station Capacity Upgrade (WCSCU)

Service Performed
Ground movement impact assessment and conceptual design of four structures connecting a new station box with the existing Victoria line platform tunnels.
Commencement - Services
April 01, 2019
Location
55 Broadway
London
SW1H 0BD
United Kingdom
Geology description

London Clay.

Geology types
Description

The WCSCU project will deliver additional capacity and step free access to the Victoria line at London Underground's Walthamstow Central station. A new station box will provide a new station entrance, a new subsurface ticket hall and connecting routes to both Victoria line platforms via escalators, stairs and lifts. Four new tunnel structures will connect the new station box with the segmental cast iron lining of the Victoria line platform tunnels. The use of traditional timber headings was chosen as the preferred construction method during conceptual design primarily due to the length of the structures (i.e. approximately 2 m each).

Activity
Construction methods
Tunneling under
3D View showing the four proposed connection structures
A construction stage of the timber heading structures
Project number
512C
Project Type
DSC
Final cost
£15 million GBP
Completion date
Ongoing

Thames Tideway

Owner
Service Performed
Review of the current design of the connection between sprayed concrete lined connection tunnels and the main (TBM) tunnel with the aim to propose efficient alternatives.
Commencement - Services
March 01, 2016
Location
80 Kirtling Street
London
SW8 5BP
United Kingdom
Geology description

The geology transitions from West to East through London Clay, into the complex Lambeth Group (clay, sand and gravel strata) into Thanet Sands, before giving way to the Chalk including flints.

Geology types
Description

The Thames Tideway Tunnel is an under-construction 25km tunnel running mostly under the tidal section of the River Thames through central London. It will provide capture, storage and conveyance of almost all combined raw sewage and rainwater that currently overflow into the river. Once constructed, the main tunnel will have an internal diameter of 7.2m and will run from -30m at Acton, West London for over 25km under central London down to -70m at Abbey Mills in the East. It will connect 34 of the most polluting combined sewer overflows (CSOs), via transfer tunnels. The tunnel will transfer the captured sewage to the Stratford to East Ham part for onward delivery to Beckton Sewage Treatment Works.

Activity
Categories
Construction methods
Tunneling under
New shaft, connection and main tunnel structures (Courtesy Tideway)
Isometric of connection between SCL and TBM tunnels
Project number
502C
Project Type
DSC
Final cost
£4.2 billion GBP
Completion date
Ongoing

Cigar Lake Mine Development

Owner
Client
Service Performed
Site supervision services, consulting, monitoring and on-site engineering performed by senior engineer and two tunnel inspectors. Subsequent design for tunnels and junctions supporting mine development.
Commencement - Services
September 01, 2012
Completion - Services
May 01, 2020
Location
2121, 11th St W
Saskatoon, SK S7M 1J3
Canada
Geology description

Highly thermo hydraulically weathered metapelites in form of weak rock and clayey-silty-sandy soils, highly anisotropic, cut with slickensided graphitic planes.

Geology types
Description

Cameco's Cigar Lake is the world's highest grade uranium deposit. It is considered one of the world's most technically challenging uranium deposits to mine. The ore body and the ground around has to be bulk frozen prior to extraction of the ore using high pressure water jets. Development of the freeze/production cross-cuts takes place beneath the ore body in unstable, soil-like, highly weathered and anisotropic rock. A flexible shotcrete lining with longitudinal slots and special yielding elements together with systematic rock bolting were utilized to cope with squeezing ground conditions. Site presence and additional engineering and design efforts supported the mine development for tunnels and junctions.

Categories
Final cost
$50,000,000
Construction methods
Special Construction techniques
Pocket excavation in unstable ground conditions
Installed yielding elements prior to spraying shotcrete
Project number
455E
Project Type
DSC
Final cost
$50 million CAD
Completion date
Ongoing

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