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Execution

Leesburg Inter-Quarry Tunnel - Execution

Service Performed
Site supervision on behalf of Luck Stone Corporation including supervision of all SEM activities, quality assurance services, cost and schedule control and design coordination on site.
Commencement - Services
April 01, 2018
Completion - Services
March 01, 2019
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) is the nation's largest family owned and operated producer of crushed stone, sand and gravel. At their plant in Leesburg, Virginia, Luck Stone Corporation acquired a new quarry, which is located to the West of Goose Creek river. An inter-quarry tunnel was constructed to link the existing South-Eastern pit with the new West pit. The tunnel's cross section is approximately 45 feet in diameter, and the tunnel's length is approximately 1275 feet. The tunnel crosses the Goose Creek river approximately 50 feet beneath. The excavation method was drill and blast in hard rock (diabase).

Activity
Execution
Special Construction techniques
Tunneling under
Tunnel length
1275 feet
South-East portal - final stage
South-East portal - construction stage
Project number
242E
Final cost
$13 million USD

Bank Station Capacity Upgrade - Site Supervision

Service Performed
Design of tunnels and shafts (primary lining, waterproofing and secondary lining). Design representation on site during construction
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) aims to relieve heavy passenger congestion during peak hours for boarding, alighting and interchange. The capacity upgrade comprises the construction of a new southbound platform tunnel and associated length of running tunnel for the Northern line, connecting passageways to the existing station tunnels, and the provision of step-free access from King William Street. The total length of tunnels is 1,300m with tunnel cross sections that range from 10m2 up to 90m2.

Activity
Execution
Tunneling under
Hybrid SCL and squareworks structures
Exposure of live LU asset (existing cast iron platform tunnel shown)
Project number
451E
Final cost
£563.8 million GBP

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
Execution
Service areas
Construction methods
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
Execution
Categories
Construction methods
South shaft
Completed tunnel section
Project number
420E
Final cost
$14.5 million USD

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
Execution
Construction methods
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

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

Edmonton Light Rail

Client
Service Performed
Dr. Sauer and Partners provided construction support services and supervision of the excavation of the Light Rail Tunnels, which were constructed using NATM.
Commencement - Services
August 01, 2011
Completion - Services
January 01, 2013
Location
1 Sir Winston Churchill Sq NW
Edmonton, AB T5J 2R7
Canada
Geology description

Glacially controlled terrain comprising clay, silt and sand deposits underlain by Mesozoic bedrock consisting of sandstone and shale.

Geology types
Description

The City of Edmonton built a 3.3km Light Rail Train extension from Churchill Station to the Northern Alberta Institute of Technology. Approximately 670m of the extension are underground consisting of ca. 430m of twin tunnels of 6m nominal diameter. NATM/SEM tunneling was applied. The software 2DOC, which was at that point used in North America for the first time, allowed real-time tracking of all geotechnical instruments on the project, as well as the recording of the actual geotechnical conditions and the grout support elements installed.

Activity
Execution
Final cost
$300,000,000
Construction methods
Tunneling under
Excavation under way
Tunnel face
Project number
437E
Final cost
$300 million CAD

Devil's Slide Tunnels

Service Performed
Construction inspection and scheduling for initial and final liner and waterproofing; analysing monitoring data and project's progress; daily site inspection and ground conditions reports.
Commencement - Services
November 01, 2007
Completion - Services
March 01, 2011
Location
585 Linda Mar Boulevard
Pacifica, CA 94044
United States
Geology description

The geological setting comprised quartz diorite, marine sandstone, conglomerate and clay-siltstone. Four main fault zones were encountered.

Geology types
Description

Devil's Slide is located south of the City of Pacifica in California along the coastal road of Highway 1. Landslides and grade subsidence in the Devil's Slide area along Route 1 have led to the road being closed for extended periods causing significant economic loss to the surrounding communities. The solution: Construct a tunnel through the mountain to bypass the dangers and reoccurring problems. Construction of 1250m twin tunnels, 9m wide, 6.8m high using Sequential Excavation Method (SEM). Additionally, drill and blast and roadheader excavation through weathered rock utilised.

Activity
Execution
Final cost
$273,000,000
Construction methods
Special Construction techniques
Groundwater control
Max Overburden
~250m
Tunnel length
1250m
Drill jumbo drilling blast holes in top heading advance face
Finished southbound tunnel with textured cast-in-situ concrete
Tunnel Portals
Aerial view of completed portals
Project number
272E
Min Overburden
<5m at portals
Final cost
$273 million USD

Bond Street Station Upgrade Execution

Service Performed
Design of SCL tunnels and access shafts linked to Central, Jubilee line, and Crossrail Link Passage. Construction supervision.
Commencement - Services
June 01, 2013
Completion - Services
May 01, 2016
Location
Oxford Street
London
W1C 2HU
United Kingdom
Geology description

London Clay

Geology types
Description

Bond Street Station serves an interchange between the Jubilee Line, the Central Line and the future Crossrail Station. New tunnels including access and lift shafts, construction adits, binocular cross passage tunnels, large concourse and connection chambers, underpass and over-bridge tunnels cutting through existing platform tunnels, and an inclined escalator tunnel were constructed in very close proximity to existing London Underground structures.

Activity
Execution
Tunneling under
Max Overburden
10-50m
Max Excavation Area (m2)
25-55m2
Excavation connection chamber
Secondary lining escalator tunnel
SCL spray of Connection Chamber
SCL Access Tunnel
SCL Tunnel connecting to existing Cast Iron Passage Way
SCL Tunnel, Excavation of Escalator Tunnel
SCL Shaft, breakout for SCL tunnel
SCL Side Drift Tunnel
Project number
419E
Final cost
£150 million GBP

Tottenham Court Road Station Upgrade Execution

Client
Service Performed
Design of SCL tunnels and access shafts linked to both Central and Northern line. Supervision during construction.
Commencement - Services
March 01, 2011
Completion - Services
January 01, 2016
Location
Oxford Street
London
W1D 1AN
United Kingdom
Geology description

London Clay formation

Geology types
Description

The major upgrade to the LU Tottenham Court Road Station has been proposed to relieve congestion, achieve step-free access and modernise the station. The major elements of the station upgrade comprised a new enlarged sub-surface ticket hall, a fire-fighting access / emergency escape shaft linked to both Central and Northern lines, a triple escalator barrel, and concourses to the Northern and Central lines. In the latter concourse two new overbridges were included to lead to the platforms via new stairs and lifts. For the tunnelling works, a particularly challenging part was to design and construct the two SCL overbridges over the operational Central line.

Activity
Execution
Final cost
$480,000,000
Tunneling under
Max Overburden
10-20m
Max Excavation Area (m2)
23-104m2
Tunnel length
13-104m
SCL side drift tunnel
Aerial view of the construction site
Sprayed Waterproofing Membrane
SCL Crosspassage
SCL Tunnel, overbridging operational Central Line Tunnel
SCL Excavation through existing Structure
Project number
411E
Final cost
£480 million GBP

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