rail tunnels is a piston relief duct, necessary to manage pressure
changes due to the movement of trains
Construction ：
• Precast segmental linings in the main TBM drives were used, but different solutions were used on the English and French sides.
Advantages:
✓ Tunneling will generate soil that has been excavated[ˈekskəˌveɪtid] and this can be used to create new land, as was done with the soil of the Channel Tunnel.
✓ Travelling through a tunnel is significantly quicker and won't be influence during adverse weather
Pro The Channel Tunnel :
>> The Channel Tunnel also referred to as the Chunnel is a 50.5kilometre undersea rail tunnel linking Folkestone in the United Kingdom with Calais in northern France beneath the English Channel at the Strait of Dover.
Background information
英吉利海峡隧道（The Channel Tunnel)又称英法海底 隧道或欧洲隧道（Eurotunnel)，是一条把英国英伦三 岛连接往欧洲法国的铁路隧道，于1994年5月6日开通 。它由三条长51km的平行隧洞组成，总长度153km，其
• began construction in 1988 and opened in 1994
• eventually closed in 2002 for incident
Engineering：
• The British Channel Tunnel Group consisted of two banks and five construction companies, while their French counterparts.
53.85 kilometers , and deeper at 240 meters below sea level.
The Channel Tunnel
The Seikan Tunnel
• Ideas for a cross-Channel fixed link appeared as uccessful tunnelling under the channel required the selection of the best rock strata .
Typical tunnel cross section:
with a service tunnel between twin rail tunnels. Shown linking the
>>On the French side, neoprene and grout sealed bolted linings made of cast iron or high-strength reinforced concrete were used.
>>On the English side, the main requirement was for speed and bolting of cast-iron lining segments was only carried out in areas of poor geology.
新概念第64课 课件
新概念二 Lesson 64 The Channel Tunnel
The Channel Tunnel
----The world's longest undersea tunnel
What is Undersea tunnel?
• An undersea tunnel is a tunnel which is partly or wholly constructed under a body of water.
>> At its lowest point, it is 75 meters deep. At 37.9 kilometers , the
Channel Tunnel possesses the longest undersea portion of any tunnel in
the world, although the Seikan Tunnel in Japan is both longer overall at
• The French Channel Tunnel Group consisted of three banks and five construction companies.
• The design and construction was done by the ten construction companies.
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Geological pro the tunnel as constructed:
>>The geology generally consists of northeasterly dipping Cretaceous strata .
>>For the majority of its length the tunnel bores through a chalk marl