SOME CONSIDERATIONS OF SUBMERGED TUNNELLING

AN INTRODUCTORY HISTORICAL SURVEY TRACES THE DEVELOPMENT OF SUBMERGED TUNNEL BUILDING, STIMULATED BY EVER INCREASING MOTOR TRAFFIC. THE TRENCH AND PRECAST TUNNEL IS THE MOST USUAL CONSTRUCTION METHOD. THE LENGTH OF THE ELEMENTS HAS INCREASED TO MORE THAN 100 M, THE WIDTH TO MORE THAN 40 M, AND THE WEIGHT TO ABOUT 50,000 TONS. THE AMERICAN TUNNEL IS BASED ON THE CYLINDRICAL CROSS SECTION WITH TWO TRAFFIC LANES; THE 'EUROPEAN' TUNNEL HAS A RECTANGULAR CROSS SECTION WHICH CAN EASILY BE ADAPTED TO THE REQUIRED NUMBER OF TRAFFIC LANES (2 X 3 OR 3 X 2 FOR INSTANCE). BECAUSE OF THE FINANCING SYSTEM AND RIGOROUS PREFABRICATION, THE CONSTRUCTION TIME OF THE CYLINDRICAL TUNNEL IS MUCH LESS THAN THAT OF THE RECTANGULAR TUNNEL. THE JOINT CONNECTION OF RECTANGULAR TUNNELS HAS BEEN MUCH SIMPLIFIED BY RUBBER GASKETS. THE FOUNDATION IS GENERALLY DIRECTLY ONTO THE SUBSOIL, BUT SOMETIMES THE SOIL CONDITIONS ARE SO BAD THAT A PILE FOUNDATION HAS TO BE USED. SOME IDEAS ARE GIVEN ABOUT POSSIBLE DEVELOPMENTS OF LONG TUNNEL CROSSING AND BRIDGE-TUNNEL COMBINATIONS. /RRL/

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Filing Info

  • Accession Number: 00235202
  • Record Type: Publication
  • Source Agency: Transport and Road Research Laboratory (TRRL)
  • Files: TRIS
  • Created Date: Feb 24 1972 12:00AM