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Design

Leesburg Inter-Quarry Tunnel - Design

Service Performed
Conceptual design with various tunnel options. Final tunnel design consisting of drawings, specifications, and calculations. Client support during bid phase.
Commencement - Services
January 01, 2017
Completion - Services
April 01, 2018
Location
Leesburg Plant
20210 Luck Lane
Ashburn, Virginia, VA 20147
United States
Geology description

Located within the Culpeper Basin, a sedimentary rock formation characterized to be of Lower Mesozoic Age. The existing Luck Stone quarry is situated in a Diabase intrusion (dyke) of this sedimentary rock.

Geology types
Description

Luck Stone Corporation (LSC) planned to open a new quarry on the Western side of Goose Creek river, a component of the Virginia Scenic Rivers System. A tunnel was envisioned to connect the new Western quarry with the existing South-Eastern one below the river. The rock cover between the tunnel and the river was approximately 50 feet. The tunnel is 1275 feet long with a diameter of 45 feet. It is designed to accommodate large scale mining trucks as well as a conveyor belt for material transport which is scheduled to be installed in the future.

Activity
Design
Construction methods
Special Construction techniques
Tunneling under
South-East portal excavation sequence
South-East portal excavation
Vertical bench drilling
Project number
242D
Final cost
$13 million USD

HS2 Euston Station

Client
Service Performed
Tunnel design (geometry, linings, alignment, connections); BIM/CAD; survey scopes; conceptual design statement.
Commencement - Services
February 01, 2018
Completion - Services
August 01, 2019
Location
Two Snowhill
London
Birmingham
B4 6GA
United Kingdom
Geology description

London Clay, Lambeth Group (Reading, Woolwich and Upnor Formations).

Geology types
Description

Euston Station will be transformed as the London terminus for HS2. The project involves building a new station alongside the Network Rail station and creating over 600m of new tunnelled connections to the Euston London Underground (LU) station. The works include two new sets of escalators serving the Victoria line and Northern line Bank branch and three new lifts providing step-free access to all lines. Tunnel diameters range from 3.6m to 11.5m with most tunnels being constructed using sprayed concrete lining. In the tightest locations squareworks tunnels have been designed.

Activity
Design
Construction methods
Existing station and its context
New tunnels (cyan) connecting HS2 and LU platforms
Project number
489D2
Final cost
£1.6 billion GBP

Bank Station Capacity Upgrade - Pile Interceptions

Service Performed
Design of tunnels where they intercept with existing building foundation piles (i.e. at four building locations).
Commencement - Services
August 01, 2013
Completion - Services
May 01, 2022
Location
London
London
EC3V 3LA
United Kingdom
Geology description

The geology comprises London Clay formation overlain by Quaternary superficial deposits and made ground.

Geology types
Description

Bank Station is a London Underground station located in the City of London financial district. It is a key interchange served by five existing lines. The Bank Station Capacity Upgrade (BSCU) comprises the construction of new tunnels adjacent to and connecting with the existing tunnels. The capacity upgrade includes the construction of 540 metres of running tunnel intercepting with existing foundation piles at four no. building locations. A bespoke solution was developed for each of the buildings and the building impact was assessed in detail.

Activity
Design
Construction methods
Tunneling under
Running tunnel intercepting with existing foundation piles
Exposure of pile during running tunnel construction
Project number
451D
Final cost
£563.8 million GBP

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
Design
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
Final cost
£4.2 billion GBP
Completion date
Ongoing

University Link - Design

Service Performed
Sub-consultant for NATM/SEM design and waterproofing design.
Commencement - Services
July 02, 2007
Completion - Services
January 02, 2009
Location
401 S. Jackson Street
Seattle, WA 98104
United States
Geology description

The geology along the alignment consists of over-consolidated glacial clay and till with fractured zones, as well as sand and silt layers.

Geology types
Description

University Link is a 5km light rail extension that runs in twin-bored tunnels from Downtown Seattle north to the University of Washington, with stations at Capitol Hill and on the University of Washington campus. The twin-bored tunnels are connected with 20 cross passages. Dr. Sauer & Partners performed the temporary and final support design for the cross passages. This included the design of excavation and support measures and the development of specific ground support categories, settlement analyses, and the structural analyses of initial and permanent lining.

Activity
Design
Construction methods
T Cross Passage
3D Finite Element Model
Project number
262D
Final cost
$1.6 billion USD

Eglinton Crosstown LRT

Owner
Service Performed
Preliminary and final SEM tunnel design. Site supervision during SEM construction
Commencement - Services
November 01, 2015
Completion - Services
December 01, 2021
Location
97 Front Street West
Toronto, ON M5J1E6
Canada
Geology description

Glacial depositional systems created a complex distribution of heavily overconsolidated till layers, separated by interstadial stratified deposits of glaciolacustrine clay, silt, and sand.

Geology types
Description

The Crosstown is a light rail transit line, which is part of the regional transportation plan for the Greater Toronto and Hamilton Area. The project will provide a 19km corridor across Eglinton Avenue, connecting ten stops at grade and 15 stations with a 10km twin-bored tunnel. Dr Sauer & Partners provided detailed design for Oakwood, Avenue, Laird and Leaside stations. A combination of Cut-and-Cover construction for the shafts and mined techniques (SEM) for the tunnels has  been utilised. Finite element analyses were carried out to determine structure capacity of linings and trigger values. Fibre reinforced sprayed concrete was used for temporary and permanent linings.

Activity
Design
Construction methods
Tunneling under
Route map (www.thecrosstown.ca)
Toronto transit map (www.thecrosstown.ca)
Project number
467D
Final cost
$4.9 billion CAD
Completion date
Ongoing

Silverline Phase III

Service Performed
Sub-consultant for NATM design.
Commencement - Services
January 01, 2003
Completion - Services
January 01, 2008
Location
500 Arborway
Boston, MA 02130
United States
Geology description

Made ground, peat, glacial till (cohesive, plastic), Boston Blue Clay and sand.

Geology types
Description

Silver Line Phase III is an underground extension of the Silver Line from the current terminal at South Station into Downtown Boston. The tunnels through Boston's Chinatown lie up to 25m below surface and include ca. 1400m long-running tunnels, two stations and complex underground junctions. The NATM design alternatives for LRT / Busway tunnels are located beneath existing subway stations and running tunnels. 3D modelling tools were utilised to create multiple alignments.

Activity
Design
Final cost
$550,000,000
Construction methods
Tunneling under
3D rendering of the Silverline Phase III alignment
NATM alternative beneath MTA's Chinatown Station
Project number
347D1
Final cost
$550 million USD

Central Subway

Service Performed
Preliminary and final SEM tunnel design at Chinatown Station.
Commencement - Services
March 01, 2010
Completion - Services
May 01, 2012
Location
425 Market Street Suite 1700
San Francisco, CA 94105
United States
Geology description

The geology ranges from soft clay (Bay Clay) to stiff sands (Colma Sands) and competent to highly fractured rock (Franciscan Formation). A considerable part of the tunnel alignment is below the groundwater table.

Description

MUNI planned a 2.7 km underground extension to the Third Street Light Rail Project. The underground section would start near Bryant Street, run along Third Street, cross under four BART Tunnels at Market Street and continue under Geary and Stockton Streets to Clay Street. Dr.Sauer and Partners was the designer for the SEM Tunnel Structures at Chinatown Station and prepared detailed excavation and support sequences as well as procedures for the construction of the large caverns and final design documents for SEM construction.

Activity
Design
Tunneling under
Route map
Overall station layout, headhouse and caverns (Rendering by JV)
Project number
358D1
Final cost
$1.6 billion USD

Exchange Place Station - Path Line Improvements

Service Performed
Tunnel excavation geometries, lattice girder geometries and layout.
Commencement - Services
October 01, 2002
Completion - Services
October 01, 2003
Location
225 Park Ave S
New York, NY 10003
United States
Geology description

Heavy foliated gneiss, schist, schistose gneiss with pegmatite intrusions occasional amphibolite; transitional (slope/rise) rock.

Geology types
Description

Exchange Place is a key station on the PATH commuter rail service between New York and New Jersey. After the World Trade Center collapse, the station and river crossing running tunnels were closed. Precautions were taken to prevent flooding of the subway system from broken water mains and sewer lines. Turning existing elements into a terminus and extending the platform tunnels by 45m involved excavating new crossovers, modifying the 5 existing tunnels, raising the invert and crown up to 3m and back filling unneeded tunnel spaces to create the ground in which new spaces could be excavated.

Activity
Design
Final cost
$25,000,000
Construction methods
3D Model of Exchange Place station
Lattice girder and shotcrete for support
Project number
355D
Final cost
$25 million USD

Crossrail Farringdon Station - Geotechnical Assessment

Service Performed
Temporary works design included design of tunnels prior to ring closure and 28 day strength as well as depressurisation design.
Commencement - Services
May 01, 2013
Completion - Services
October 01, 2015
Location
Cnr Charterhouse St & Farringdon Rd
London
EC1M3HN
United Kingdom
Geology description

Excavation encountered almost all the London basin units but mainly Lambeth Group, comprising stiff to very stiff overconsolidated clays to water bearing sand units.

Geology types
Description

The station is located in central London between Tottenham Court Road and Liverpool Street Crossrail (CRL) Stations. Constructed in the geologically most complex area in the whole of CRL, an optimised geotechnical and SCL tunnel design was implemented, which resulted in significant time and cost benefits for the project. Using a dynamic 3D geological model in conjunction with SCL tunnelling represented a key element of the geotechnical risk management framework.

Activity
Design
Service areas
Construction methods
Special Construction techniques
Tunneling under
Groundwater control
Max Overburden
25 m
Max Excavation Area (m2)
95
Tunnel length
1000 m
Qualitative geotechnical risk mapping
Exerpt of the 3D finite element model
Project number
222D5
Min Overburden
5 m
Final cost
£300 million GBP

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