THE VENTILATION OF ROAD TUNNELS --PAPER 2-- MONT BLANC TUNNEL VENTILATION

A DISCUSSION IS GIVEN OF THE PROBLEMS ECONOUNTERED DURING THE DESIGNING OF THE VENTILATION SYSTEM FOR THE 11.6 KM MONT BLANC TUNNEL, OPENED IN 1965, DUE TO THE HEIGHT OF THE ROCK ABOVE THE TUNNEL WHICH PREVENTED THE SINKING OF VERTICAL VENTILATION SHAFTS. A LONGITUDINAL SYSTEM WAS DESIGNED WHICH COULD VENTILATE THE SHAFT ALONG ITS ENTIRE LENGTH, USING A NUMBER OF FOUR-SPEED FANS. TESTS ARE DESCRIBED SHOWING THE EFFICIENCY OF THE SYSTEM WHICH, AFTER SEVEN YEARS OF OPERATION, COPES WITH A MAXIMUM HOURLY RATE OF 650-700 VEHICLES. AN UNEXPECTED FACTOR HAS BEEN THE 30.45 PERCENT YEARLY INCREASE IN THE NUMBER OF COMMERCIAL VEHICLES USING THE TUNNEL. FUTURE EXTENSIONS TO THE VENTILATING SYSTEM WILL BE NECESSARY TO HANDLE THE GROWTH OF DIESEL-ENGINE COMMERCIAL VEHICLES, THE ENGINES OF WHICH HAVE NOT BEEN DEVELOPED TO THE LEVEL OF COMBUSTION EFFICIENCY OF PETROL ENGINE VEHICLES. /TRRL/

Media Info

  • Features: Figures; Tables;
  • Pagination: p. 226-31
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00203907
  • Record Type: Publication
  • Source Agency: Transport and Road Research Laboratory (TRRL)
  • Files: TRIS
  • Created Date: Aug 5 1973 12:00AM