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The track : a complex system / Project 6
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| Subsidence: engineering digs into the problem |
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| Rail & Recherche n°24 - July/August/September 2002 |
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While the Research Dept. carries out long-term projects, Engineering is looking for
answers to more urgent problems, like the collapse of the track on the Paris-Lille highspeed
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Despite inspections and preventive
measures, the threat of subsidence still
persists on the TGV Nord line. SNCF is
conducting RFF-funded research to
determine the best way to locate the
underground cavities that cause it. This
644,000-euro project is to run from June
2002 to the end of March 2003.
Near the Ablaincourt station, in northeastern
France, a team headed by Marie-
Josèphe Poitout of the Engineering
Department’s research office is experimenting
on a siding that has the same
structure as a traffic track. Two cavities
similar to World War I trenches are being
dug. Such cavities, which were badly
filled after the war and are now difficult
to detect, are the cause of 60% of the
subsidence on the high-speed line.
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