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Site Supervision & CM, QA/QC

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
Service areas
Site Supervision & CM, QA/QC
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
Service areas
Site Supervision & CM, QA/QC
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

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
Service areas
Site Supervision & CM, QA/QC
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
Service areas
Geological Engineering, Site Supervision & CM, QA/QC
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

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
Final cost
$300,000,000
Service areas
Site Supervision & CM, QA/QC
Construction methods
Tunneling under
Excavation under way
Tunnel face
Project number
437E
Final cost
$300 million CAD

Cigar Lake Operation

Owner
Service Performed
Site supervision services, consulting, monitoring and on-site design performed by senior engineer and two tunnel inspectors.
Commencement - Services
September 01, 2012
Completion - Services
August 01, 2015
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 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 take place beneath the ore body in unstable, soil-like highly weathered and anisotropic rock. A flexible shotcrete lining with longitudinal slots of special yielding elements together with systematic rock bolting were utilized to cope with squeezing ground conditions.

Categories
Final cost
$50,000,000
Service areas
Site Supervision & CM, QA/QC
Construction methods
Special Construction techniques
Pocket excavation in unstable ground conditions
Installed yielding elements prior to spraying shotcrete
Project number
455E
Project Type
Final cost
$50 million CAD
Completion date
Ongoing

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
Final cost
$273,000,000
Service areas
Site Supervision & CM, QA/QC
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

Sound Transit Beacon Hill Station

Service Performed
Optimizing station and tunnel configurations, Interpreting geologic information, preliminary and detailed design, developing 3D Finite Element Models and performing structural and seismic design.
Commencement - Services
January 01, 2002
Completion - Services
January 01, 2009
Location
401 S. Jackson Street
Seattle, WA 98104
United States
Geology description

Beacon Hill Station is located 49 m below the ground surface in complex glacial soils with multiple groundwater horizons.

Geology types
Description

Beacon Hill Station is part of the 22.5 km initial segment of Sound Transit's Central Link Light Rail. It is located 49 m below the ground surface in complex glacial soils with multiple groundwater horizons. The project comprises deep mined station tunnels and two 1.5 km long running tunnels excavated using a tunnel boring machine. The mined station was excavated through compressible glacial soils with multiple groundwater horizons using conventional mining techniques. The access shafts and station headhouses were constructed using slurry walls and cut-and-cover techniques.

Activity
Service areas
Construction methods
Special Construction techniques
Tunneling under
Tunnel length
1.5km
Beacon Hill Station Layout
Tunnel Excavation under way
Project number
418C
Final cost
$250 million USD

Ottawa Light Rail

Service Performed
Tender design, preliminary and full detailed design including execution drawings for three mined station caverns, adits and shafts. Additionally, construction support services on site were provided.
Commencement - Services
March 01, 2012
Location
529 Albert St
Ottawa, ON K1R 7Z0
Canada
Geology description

The geology varies from strong limestone to competent and fractured shale. A soft ground section includes highly disturbed glacial sand/silt/clay deposits with a high water table.

Geology types
Description

The confederation Line in Ottawa encompasses 15 stations and stops; its centre piece is a 2.5km long tunnel with three underground stations underneath downtown Ottawa. The mined construction method for the stations was chosen in order to minimize the impacts to the surface. The underground stations are located directly adjacent to existing, sensitive and sometimes historic buildings requiring detailed studies of risks during construction and risk mitigation measures.

Activity
Service areas
Tunneling under
Tunnel length
2.5km
Cavern construction under way
Downtown stations located between high-rise buildings
Mined Caverns directly adjacent to existing basements
Special Excavation Sequences incorporating pre-tensioning
Large-Scale 3D Numerical Modelling incorporating the surroundings
Project number
123
Final cost
$3 billion CAD
Completion date
Ongoing

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
Service areas
Site Supervision & CM, QA/QC
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

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