Over a century of history
From Napoleon’s time to the mid 19th cen-
tury, many ideas or proposals for a fixed
link appeared. Geotechnical investigations
evidenced the presence of Chalk strata
adequate for tunnelling. French engineer
Thomé de Gamond spent most of his life
attempting to find practical solutions.
In the 1880’s, undersea tunnelling actually
started at Shakespeare Cliff and Sangatte,
but was stopped for political reasons. The
nearly 1.8 km dug on each side were found
intact in UK (1987) and France (1958).
In 1974, a tunnel scheme was stopped for
political reasons on British side.
In 1979 the European Channel Tunnel
Group initiated studies for various private
railway tunnel schemes. A competition was
organized by the French and British go-
vernments in 1985. Four main projects
were submitted : Euroroute, a hybrid solu-
tion of a bridge-tunnel-bridge, Europont, a
suspended bridge, Transmanche Express,
four bored tunnels allowing both railway and
road traffics, and Eurotunnel, a rail shuttle
service for road vehicles with provision for
through trains, using 3 tunnels, two for rail
and one for maintenance.
The concession to build and operate the
Fixed Link across the Channel was awar-
ded on 20th January 1986 to France-Man-
che and Channel Tunnel Group subse-
quently to become Eurotunnel (ET) and
Transmanche Link (TML) in March 1986.
The Fixed Link
Transportation system
The Fixed Link connects road/rail networks
of UK and France and allows mixed traffic
at short headway (3 minutes between
trains) and high speed (100 to 160 km/h) of
national trains and special "Shuttles".
"Shuttles" allow rail transportation of road
vehicles (cars, lorries, coaches..), road to
road, from one country to another.
Two terminals connect road and rail
networks. They are linked by three 50.5 km
long tunnels - 9.3 underland in UK, 38 un-
dersea and 3.2 underland in France - one
service tunnel between both running tun-
nels, fitted with safety and electronical
equipments to the highest standards.
Services to users
Road users drive their vehicles from mo-
torways to aboard shuttles through the
terminals, stay abord their vehicle, and exit
freely on the other side after a 35 minutes
journey from platform to platform (27 in
tunnels). Tolls, customs and allocation,
directing of road vehicles is carried out prior
to loading. No booking: shuttles are
available at least every 30 minutes.
Freight or passengers direct rail journey
between Paris, London, and Brussels is
also possible. Eurostar trains reach London
from Paris in 3 hours.
Project organisation
Eurotunnel
Eurotunnel (ET) is a bi-national company
formed by Channel Tunnel Group (UK) and
France Manche S.A. (FR). It is owner and
operator of the project, and client of the
contractor TML. During tender period
(1985-86), ET was owned by banks (50%)
and by the 10 companies wich will become
TML (50%).Later, ET became independant,
transfered to shareholders and banks.
Contracts
The Concession Agreement (March 1986)
is awarded for 65 years by the governments
of UK and France to Eurotunnel. It is
based on the proposal submitted in 1985
and includes the key requirements of the
Governments.
The Construction Contrat between Euro-
tunnel and Transmanche-Link sets out the
CHANNEL TUNNEL
PROJECT OVERVIEW
Above, Left: French Engineer Thomé de Gamond (1807-1876) has been promoting many technical solutions for a
Fixed Link between 1834 and 1868; He even collected samples by over 30 m deep without diving equipment.
Above, Right: The Beaumont boring machine, built in the 1880's by the Société de Construction des Batignolles (now
Spie Batignolles), dug 1.8 km on each side of the Channel. Below: Two of the proposals presented in 1985, Europont
(Left, a suspended bridge), and Euroroute (Right, which included bridges and tunnels connected by artificial islands).
EUROTUNNEL won the competition in 1985: 3 tunnels, two for rail and one for maintenance, allow mixed traffic of
special "shuttles" carrying cars and national trains (a EUROSTAR train is shown on the picture).They are connected
every 375m by cross passages or technical rooms housing electromechanical equipments,and every 250m by piston
relief ducts. Service Tunnel Transport System, used for maintenance, comprises 24 twin-cab rubber-tyred vehicles,
top speed 80 km/h (incl. 12 ambulances and fire vehicles), electronically guided by an embedded cable in concrete.
Author Pierre-Jean Pompée
terms for design, construction and
commissioning of the Fixed Link.
ET is also linked to the banks by a loan
agreement, and to national railways by a
usage agreement.
Safety Authority and Maitre d'Oeuvre
The project is supervised on behalf of both
governments by the bi-national
Intergovernmental Commission (IGC)
including a Safety Authority. Design, pro-
cedures, specifications, construction
(particularly environmental, operational and
safety issues), have been reviewed by
experts appointed by the Safety Authority.
The Maître d’Oeuvre is a technical auditor
reporting to ET, the IGC, and the Banks.
TML,Channel Tunnel Contractor
Transmanche Link (TML) is the Contractor
responsible for the design, construction,
and commissioning of the project.
TML is a bi-national Joint Venture of two
operating companies, each of them being
itself a joint venture: "GIE Transmanche
Construction" links 5 French companies
(Bouygues, Lyonnaise des Eaux-Dumez,
Société Auxiliaire d’Entreprises, Société
Générale d’Entreprises, Spie Batignolles),
and "Translink JV" links 5 British companies
(Balfour Beatty, Costain, Tarmac, Taylor
Woodrow, Wimpey).
These 10 contractors have together an
international experience of tunnelling and
mechanical/electrical engineering works
representing thousands of kilometers.
Unprecedent challenge
100 Billions Francs financial challenge
The client, owner, and operator of the sys-
tem, Eurotunnel, had to be created and
financed through a pool of 203 different
banks worldwide, using only private funds
without any government money.Insurances
for works and completion, and multiple
methods of payments to man age techni-
cal risks added to financial complexity.
Bi-national and human challenge
French and British Engineering methods
and expertise had to be brough together,
integrating executives from 10 companies,
incorporating and training 13,000 people
(5300 in France, 90% local, trained from
basic to highly qualified level in 3 years),
into a single project team.
Fast-track programme
Design, construction and commissioning
was completed within 8 years. 150 km of
tunnelling had to be completed in 4 years,
fixed equipment installation within 2 years
after breakthrough, and commissioning
including rolling stock, within 1 year.This
meant, in less than 3 years, to :
- create and organize TML, a company
employing 13,000 persons, with 10
billions francs yearly turnover.
- launch 11 TBMs with their logistics.
Each task (design, civil works, installation of
fixed equipments, track, rolling stock tests,
commissioning) has widely (over one year)
overlapped on the next one.
Meanwhile, tunnel environment was
sustained by temporary ventilation, drai-
nage, water, power, communication and
monitoring systems, modified or removed,
as permanent ones, of comparable
capacity but totally different concept, were
commissioned at the same time.
Despite many unforeseen problems,
tunnelling works achieved the original 1986
programme.
High-tech research and developpement
Transfer a motorway traffic through hybrid
airport-sized terminals (partly motorways
partly train stations, airport-type security
principles) onto an entirely new rail system
with minimum transit time, with shuttles
travelling on high capacity, high speed,
mixed traffic rail network, in a confined tun-
nel environment, with strict operational and
safety criteria , meant to develop, in half the
usual time for such tasks :
- a very high integration between works
and specific transport equipment,
- an unprecedent rolling stock: the hea-
viest trains (2300 T), the more powerfull
locomotives ever (5.5 MW), the
Above:Shakespeare Cliff, main tunnelling site on UK
side, from where started all British boring machines.
Below:Shakespeare Cliff in 1988. Tunnelling spoil is
being used to build a platform at the bottom of the cliff.
more complex safety embarqued sys-
tems (50 km cables per wagon), hea-
viest traffic on rails (twice the most traf-
ficked railway ever), the largest wagons
on standard gauge 1.435 m track (
section 4x5.5 m), travelling at 140 km/h
a few centimeters from the walkways.
- the largest real-time data system ever
(excepting in space exploration) able to
manage shuttles travelling at trains
speeds (140 km/h) with the kind of
headway (3 minutes between trains) only
found on much slower, lighter, and
smaller urban subways trains.
Design challenge
The scale of the design is massive. The
project is contractually defined by the
following categories of performances :
(a) system throughput
(b) performance of shuttle trains
(c) environment
(d) safety and passengers evacuation
(e) scenarios and operational procedures
For fixed equipment and rolling stock, the
emphasis on engineering activities shifted
to design monitoring and interfaces
management across all engineering
disciplines. The challenge, in the early
stages, was to provide sufficient information
to allow civil works to proceed.
External influences
Organisations involved (Banks, Safety
Authority, environmental issues, local
authorities, public opinion..) interfered
strongly and permanently on a project
constantly under media spotlight.
Both unprecedently huge and accurate
The projects combines the largest size and
complexity ever in civil works (longest
undersea tunnels, strongest concrete,
works to last 120 years...), with
unprecedent reliability and accuracy (a few
cms or mm tolerances to meet undersea at
18 km distance, to align track and
walkways,..). A high speed train, carrying
cars, at urban subway headway, with a
nuclear concept for safety, using 150 km of
tunnels driven within 150 mm tolerances!
TML organisation
Management principles
The whole project was beakdown into
groups: French Construction, UK Cons-
truction, Transport System/Engineering.
Each group was divided into human-scaled,
manageable, sub-projects: tunnel
construction, terminal construction, precast
factory, M&E installation for Construction
Groups.Transport System/Engineering
Group was splited into primary systems
(power supply, catenary, ventilation, etc...).
Quality system
The need for a global, planned, approach
for the achievement of quality led to a
classification allowing flexibility, with re-
quirements depending on the criticality of
tasks: quality requirements are identical for
all tasks, but the methodology for
management of this quality is graded from
level 1 to level 3, according to complexity,
“ maturity ” of the technology used, and
impact of a disorder on the overall works.
Design studies
Design included four phases: Development
Study, Outline Design (APS), Definitive
Above: Sangatte Shaft (55 m diam, 65 m deep),
concentrating all tunneling activities on French side.
Below : View inside the shaft. 6 precast segments are
being transfered into tunnels.
Sangatte worksite: Precast plant, shaft with facilities,
and Fond Pignon dam where tunnel spoil is stored.
Overall project design, procurement, construction, and commissioning programme.
Design (APD) and Detailed Design (PEO).
Functional studies, civil/electro-mechanical
design, and construction overlapped
widely (over 1 year) one on each other.
Engineering management concentrated on
running a centralised TML organisation, to
actually co-ordinate all aspects of design.
Close cooperation between engineering
and construction departments inTML,
through site engineering teams, helped to
meet the tunnelling target dates.
The huge volume and diversity of the deve-
lopment and design workload and the range
of specialities involved, has led to
subcontract part of specialized expertise to
external design organisations. Extensive
use of major independent consultants was
done in UK. French member companies of
TML created fully integrated design teams,
such as BETU ("Tunnel design office"), and
BETER ("Terminal design office").
Programme management
A hierarchical planning/control system
allowed overall strategic planning, detailed
day-to-day planning of long linear works,
and proper reporting to management.
Programmes at manageable size were
produced from level 1, overall project pro-
gramme (covering tasks in both the UK and
France), to level 4, detail programmes in
various formats (4-week look-ahead
programme, co-ordination programmes, ..)
A real-time computerized reporting system
allowed to monitor remotely, day by day,
progress on all aspects of the project.
(tunnelling, earthworks, installation..).
Commissioning
Unprecedent procedures have been esta-
blished to guarantee passengers safety and
start up the system. Tests included several
phases : 900 subsystems individual tests,
primary systems empty test, primary
systems full load test, overall transport
system test.
1000 Eurotunnel staff have been trained by
TML. 660 operating manuals in both
languages (24 copies each) have been
delivered. 140 spare parts lists including
18,000 items have been established.
Scope of civil engineering
Main Railway Tunnels (RTs)
The two parallel running tunnels are 50 km
long, at 30 m distance, lined diameter is
7.6 m, excavated diameter is 8.8 m.There
are lined with high strength precast
concrete segments. Ground conditions,
watery and faulted in France, led to rings
formed by 6 waterproof segments bolted,
instead of 9 segments in UK, unsealed and
unbolted.
Each running tunnels houses a single line
rail track, overhead catenary, power supply,
drainage, cooling pipes, two walkways, and
auxiliary services.
Service Tunnel (ST)
The service tunnel is 50 km long, lined
diameter is 4.8 m, excavated diameter is
5.8 m. Located between running tunnels, it
provides access to these in both normal
and emergency conditions.
The Service Tunnel Transportation System
includes 24 rubber-tyred vehicles rolling
(top spped 80 kph) on cast-in-place
concrete, electronically guided by an
embedded cable. It allows maintenance of
permanent equipments.
Special underground works
. 2 undersea huge crossover caverns (160
m long, 180 to 270 m2 cross section),
located at the third points of
Geological profile and description of the tunnels. All underground works are built within the Chalk Marl, except part of the underland sections.
Above : Launching the "T2" Tunnel Boring Machine
(TBM) from Sangatte Shaft (running tunnel north
unsersea).Below : Inside the control cab of a TBM.
Tunnel views during works, showing temporary
equipments (trains, track, water pipes, power and
communication cables..): Service Tunnel (above)
before breakthrough with ventilation duct. Running
Tunnel (below), near a piston relief duct, with still
temporary catenary, track, and pipes, but also some of
the permanent equipment already installed.
Structures of the French crossover cavern
running tunnels,enabling a train to cross
from a tunnel to another, to close tunnel
sections to traffic during maintenance .
. 270 cross passages of 3.3 m internal
diameter, every 375 m, between service
tunnel and running tunnels.
. 194 piston relief ducts (2.0 m internal
diameter), linking running tunnels every
250 m .
. 156 electrical rooms, and 58 signalling
rooms (internal diam 3.3 to 4.8 m),
housing fixed equipment for power
supply and control and communications,
lined with cast iron or concrete, accessi-
ble from service tunnel only.
. 5 pumping stations excavated.
Terminals
The Terminals, connecting the Eurotunnel
Transportation System to road and rail
networks on both sides of the Channel, are
designed to ensure all services to the
users, and operation, management,
maintenance and safety of the system.
Coquelles Terminal
The French terminal covers 700 hectares
(size of Orly Airport) of land mostly unsui-
table for building and agriculture, and
included over 12,000,000 m3 of earthworks.
Due to space availability, rolling stock
maintenance is concentrated on the French
side. Soils consolidation and extensive
drainage works (250,000 m3 storage
tanks) had to be carried out.
Folkestone Terminal
The site for the UK terminal, identified
during previous, aborted, 1974 project,
covers some 140 hectares including access
roads. The main terminal area is 2.5 km
long and 800 m wide at the west end
tapering to 150 m at the east end.
Sangatte shaft/Fond Pignon dam
The huge shaft (diam.55 m, 65 m deep) is
the French tunnelling site. Located at
Sangatte near the coast about 3.2 km from
the Beussingue Portal, it used to house all,
highly sophisticated, tunnelling logistics. It
now connects major permanent services
(ventilation, cooling etc.. ) to tunnels.
Fond Pignon, a large dam built over former
2nd World War works from the Atlantic
Wall, 1.6 km away from Sangatte, stores
5,400, 000 m3 of tunnelling spoil.
Shakespeare Cliff
It is the UK tunnelling site. The adit A1 and
the short stretch of tunnel built in 1974 has
been incorporated to new works excavated
using the NATM technique.
The chalk spoil placed at the Shakespeare
Cliff Lower Site, about 200 m from the cliff,
in a 1700 m long seawall of mass concrete
contained by a double row of sheet piles, is
now a landscaped platform housing
permanent services of the tunnel.
Portals aerea
Portals are tunnel entrance and exit. On
French side, the 2,000,000 m3-trench at
Beussingue allows access to the portal.
On British side, three parallel tunnels have
been built through Castle Hill, 493 m long,
built using NATM primary lining and an in-
situ secondary concrete lining. There are
connected to the main, TBM-excavated,
tunnels through Holywell works, which are
reinforced concrete box structures, 512 m
long, built within an open cut.
Transportation system
Primary systems:
- power supply,
- traction and catenary,
- mechanical,
- control and communication,
- signalling ,
- track.
Power supply
Main functions:
- receive power from both national grids,
transform voltage for traction and auxi-
liary uses, deliver power for auxiliary
services, and provide system earthing.
- automatic switch, in case of failure, from
one grid to the other, or from north to
south running tunnel, or from a technical
room to the nearest one.
- provide lighting in tunnels/terminals.
Main quantities:
- 2 main Terminal substations (1 in France
and 1 in UK), 160 MW each (equivalent
of a city of 250,000 inhabitants),
tranforming power received from the
French grid (225 kV) and the UK grid
(132 kV) into 25 kV for catenary to power
the trains and 21 kV to feed auxiliary
services such as ventilation, drainage
and cooling systems .
- 28 secondary substations in tunnels
transforming 21 kV into 3.3 kV.
British Terminal at Folkestone (left), and French Terminal at Coquelles site (right).
Former tunneling sites on both sides of the Channel are
now landscaped and house permanent facilities
(ventilation, cooling, fire fighting, and diesel power plants,
electrical equipments....). Shakespeare Cliff lower site
has been built with tunneling spoil (right, above), and is
now a 25-Ha platform (right, below). Sangatte Shaft, once
the complex construction facilities removed, c
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