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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

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

Brenner Base Tunnel - Lot H51 Pfons-Brenner

Owner
Service Performed
Dr. Sauer & Partners provided tender support services.
Commencement - Services
December 01, 2016
Completion - Services
April 18, 2017
Location
Innsbrucker Bundesstraße 67
5020 TYROL
Austria
Geology description

Located within the Alps, the geology comprises phyllite, schist, marble and gneiss including main fault zones as well as major water ingress sections combined with a maximum overburden of 1300m.

Geology types
Description

The Brenner Base Tunnel (BBT) is a 64km long railway tunnel connecting Austria and Italy. Once completed, it will be the world's longest rail link underground. In addition to the two main tubes, the project comprises a complex set up of exploration adits, crosscuts, emergency stops and additional access tunnels, excavated by TBM and SCL methods. Dr. Sauer & Partners provided tender support services for the 18km lot H51 Pfons-Brenner and was responsible for creating the bid documents as well as conducting QA/QC services. The documents covered issues such as TBM choice, annular gap filling, reuse of excavated rock, rail delivery of construction materials, construction logistics and pre-excavation grouting.

Activity
Categories
Construction methods
NATM, TBM
Max Overburden
1300
BBT alignment (courtesy of BBT SE)
Lot H51 alignment (courtesy of BBT SE)
Project number
486C
Final cost
€1.3 billion EUR

University Link - Execution

Service Performed
Site supervision services, consulting and monitoring.
Commencement - Services
December 01, 2011
Completion - Services
August 01, 2012
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 project further includes 20 cross passages located in soft ground and a maximum design water head of 60m. To deal with the prevailing geological conditions, specific ground support categories were developed. Steel fibre reinforced initial lining, sheet membrane waterproofing and CIP final lining were utilised.

Activity
Construction methods
NATM, TBM
Cross passage excavation
Propping of TBM tunnel at cross passage
Probe drilling at cross passage
Finished cross passage
Project number
262E
Final cost
$1.6 billion USD

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
Construction methods
NATM, TBM
T Cross Passage
3D Finite Element Model
Project number
262D
Final cost
$1.6 billion USD

Crossrail C121 SCL Design CAT3 Check

Service Performed
Specialist sub-consultant for the analysis, design check, and design improvement recommendations of SCL structures.
Commencement - Services
January 01, 2011
Completion - Services
December 01, 2013
Location
25 Canada Square
London
E14 5LQ
United Kingdom
Geology description

The SCL tunnels are located in London Clay and Lambeth Group with overlying strata of terrace gravels and made ground.

Geology types
Description

Crossrail is a 118km railway line along an east-west route across London. Its central section runs via 21km twin-bore tunnels connecting eight underground stations and represents one of the world's largest infrastructure projects. Dr. Sauer & Partners was assigned to provide Category III independent design checking services on the Sprayed Concrete Lining works for the complete Whitechapel and Fisher Street SCL structures. Additional 3D non-linear FEA and assessments were carried out for the wraparound and junction structures of the Liverpool St Station and the Bond St Station.

Activity
Construction methods
NATM
Tunneling under
FEM results of binocular structure at Fisher Street Crossover
Fisher Street Crossover under construction
Project number
222C2
Final cost
£16 billion GBP

Reshen Kalimash Motorway Project

Service Performed
Dr. Sauer & Partners in joint venture with iC Consulenten provided mitigation and tunnel stabilisation as well as NATM redesign following a tunnel collapse.
Commencement - Services
November 01, 2009
Completion - Services
July 01, 2010
Location
Sami Frasheri No. 33
Tirana
Albania
Geology description

The geological setting is influenced by the Alpine geosyncline resulting in a complex tectonic behaviour of a variety of igneous and metamorphic rocks cut by major fault zones.

Geology types
Description

A major collapse during construction of the Thierre Tunnel in 2009 led government officials to call on NATM experts to come up with an innovative fix for the 5.6km, two-lane twin tunnel, which is part of the new Reshen Kalimash Motorway. Recommended stabilisation measures by the Dr. Sauer/iC JV such as backfilling, ribs and fibre shotcrete were implemented and halted creep movements. An alternative design was developed and replaced the original horseshoe profile by an ovoid shape. Pre-treatment, excavation works and support installation were accompanied by extensive monitoring.

Activity
Final cost
$1,000,000,000
Construction methods
NATM
Tunneling under
Stabilisation measures: Backfill and fibre shotcrete "egg"
Ovoid shape emerging from horseshoe profile
Project number
428E
Final cost
$1 billion USD

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