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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
Construction methods
NATM, SCL
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
Construction methods
SCL
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
Construction methods
SCL
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

Bank Station Capacity Upgrade - Defects Survey

Service Performed
Defects surveys of the London Underground existing facilities predicted to settle 1 mm or more due to the planned station upgrade works.
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. Defects surveys of the LU existing facilities predicted to be impacted by the BSCU works had to be carried out before construction started. All existing facilities expected to be within the 1 mm settlement contour were inspected for defects.

Activity
Service areas
Construction methods
SCL
Tunneling under
Defects survey in the existing running tunnel
Defects survey on the existing station platform
Project number
451C1
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
Categories
Construction methods
SCL, TBM
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

Bank Station Capacity Upgrade - Impact Assessment

Service Performed
Assessment of the impact on existing cast-iron and precast concrete tunnel linings (in total approximately 300 assets.) including empirical and finite element calculations.
Commencement - Services
January 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 comprising river terrace deposits and alluvium which are generally overlain by 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. A staged, risk-based approach was used to efficiently assess the affected existing assets and determine an appropriate mitigation and monitoring scheme. Empirical methods and complex numerical models were used at the different stages of the assessment, to understand the risk to the existing railway and how they could best be managed while minimizing disruption to the station and its users.

Activity
Service areas
Construction methods
NATM, SCL, TBM
Tunneling under
Existing escalator at Bank Station
FE model of existing (green) and new (red and pink) structures
Project number
451D_1
Final cost
£563.8 million GBP
Completion date
Ongoing

Luck Stone Fairfax Plant – Inspection Works

Service Performed
In-depth inspection of a connector tunnel in accordance with TOMIE manual and the SNTI manual of the U.S. Department of Transportation - FHWA.
Commencement - Services
July 01, 2016
Completion - Services
July 31, 2016
Location
15717 Lee Hwy
Centreville, VA, VA 20121
United States
Geology description

The prevalent rock type of the tunnel is diabase. The rock mass is moderately jointed, with closely to very closely spaced joints. The rock is slightly weathered.

Geology types
Description

Inspected tunnel connects two quarries at the Luck Stone Corporation Fairfax plant. The tunnel crosses beneath the Lee Highway (US Route 29), in a North-South direction. Built ca. 1975, the tunnel is partially unlined and in rock; approx. 190 feet long and approx. 22 feet wide and 22 feet high. As the Northern quarry side is already exhausted, the tunnel is rarely used with just one or two transits per day.
Dr. Sauer & Partners performed an in-depth inspection of a connector tunnel; assessed the tunnel condition and provided remedial measures.

Activity
Service areas
Construction methods
NATM, SCL
Tunneling under
Connector Tunnel - North Portal / Highwall
Connector Tunnel - South Portal / Highwall
Project number
242E1
Final cost
n/a

Eglinton Crosstown LRT – Inspection Works

Service Performed
Initial, detailed inspection of underground structures. Condition assessed and rated according to the 'Highway and Rail Transit Tunnel Inspection Manual (2005)' of the U.S. Department of Transportation - FHWA.
Commencement - Services
January 01, 2016
Completion - Services
December 01, 2017
Location
Yonge Street
Toronto, ON M4S2C6
Canada
Geology description

The geology comprises heavily over-consolidated hard plastic glacial till layers, stratified deposits of stiff to hard clays and dense, non‐plastic, silt and sand.

Geology types
Description

The Crosstown LRT Project is a Light Rail Transit Line that will run along Eglinton Avenue between Mount Dennis and Kennedy Station. This 19km corridor will include a 10km underground section between Keel Street and Laird Drive. This section comprises 2 bored running tunnels; 12 stations of which 3 (Laird, Avenue and Oakwood) will be built underground using the SEM method; 12 cross passages connecting the bored running tunnels and 3 emergency exit buildings. Dr. Sauer & Partners performed an initial, detailed inspection of the bored running tunnels, every cross passage and every emergency exit building.

Activity
Service areas
Construction methods
NATM, SCL, TBM
Inspection of the Segmental Tunnel Lining
Inspection of the Cross Passage Entrance
Project number
467E1
Final cost
$8.25 billion CAD
Completion date
Ongoing

City Trunk Line South

Client
Service Performed
Site supervision for SEM/NATM works
Commencement - Services
July 01, 2016
Completion - Services
November 01, 2016
Location
111 Hope St
Los Angeles, CA 90012
United States
Geology description

Wash deposits consisting of moderately dense sand, silty sands and sandy silts.

Description

The constructed tunnel is part of the City Trunk Line project in L.A. (replacement of an existing water trunk line). The tunnel is located at the junction of Riverside Drive and Whitsett Avenue. It is between eight and ten feet in diameter and has a total length of 252 feet. To fit between the existing structures in the ground (foundation piles of a bridge), the tunnel follows an S-shape and is divided into sections with different geometries. The tunnel was built using NATM/SEM construction methods. The primary support measures included fibre reinforced shotcrete, lattice girders and spiles (rebar spiles and grouted pipe spiles).

Activity
Categories
Construction methods
NATM, SCL
South shaft
Completed tunnel section
Project number
420E
Final cost
$14.5 million USD

C305 Eastern Running Tunnels

Service Performed
Tunnel design, engineering support, geotechnical engineering and site supervision services were provided.
Commencement - Services
February 01, 2011
Completion - Services
December 01, 2012
Location
London
London
EC1M 6BY
United Kingdom
Geology description

Geological locations of the cross passages vary from London Clay to Lambeth Group and Thanet Sands.

Geology types
Description

Contract C305 is the biggest design-bid-build construction contract of the Crossrail (CRL) project and includes the eastern running tunnels of CRL's central section with launch shafts and SCL launch adits for TBMs at Limmo Peninsula, SCL caverns and launch adits for TBMs at Stepney Green and 10 SCL cross passages between the running tunnels with lengths up to 30m. At the Limmo Peninsula site a 40m deep and 30m diameter SCL shaft was built. At the shaft bottom in Stepney Green, two 30m long and up to 10m wide SCL launch adits were constructed followed by two 14m high and up to 18m wide, SCL caverns with single sidedrift and double sidedrift cross sections.

Activity
Construction methods
NATM, SCL
Max Excavation Area (m2)
50-130m2
Tunnel length
15m
Limmo Main Shaft
Limmo Auxiliary Shaft bottom
Platform Tunnel West - Excavation - TBM Tunnel Enlargement
3D Model Limmo Auxiliary Shaft
Limmo Shafts and Tunnel layout - left Auxiliary Shaft - right Main Shaft
Project number
222E3
Final cost
£500 million GBP

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