TWO DIFFERENT EXCAVATING METHODS APPLIED TO NIHONZAKA TUNNEL OF TOKYO-NAGOYA EXPRESSWAY

THE NIHONZAKA TUNNEL, IN TWIN TUBES, IS OVER 2,000 M. IN LENGTH. CONSTRUCTION WAS INITIATED AT BOTH PORTALS USING TWO DIFFERENT METHODS. SIDE WALL PILOTS FOLLOWED BY FULL SECTION DRIVING WAS ADOPTED FOR THE EAST, WHILE THE DRIVING OF THE HALF WAS APPLIED FOR THE WEST. BASALT PREVAILED EXCEPT FOR SOME CONGLOMERATE ROCK. THE TWO METHODS WERE COMPARED IN RELATION TO: (1) CONSTRUCTION PROCEDURE, (2) EQUIPMENT, (3) ACTUAL PROGRESS SCHEDULE AND CYCLE TIME, (4) DRILLING HOLES, BLASTING, AND OVER EXCAVATION, (5) HAULING OF EXCAVATED MATERIAL, (6) INSTALLATION OF STEEL SUPPORTS, AND (7) ARCH LINING. ALTHOUGH THE METHODS WERE SIMILAR IN GEOLOGICAL CONDITIONS, NAMELY, WATER LEAKAGE CONDITION THE SAFETY AND PROGRESS SCHEDULE SHOWED THAT BOTH METHODS HAD DISTINCT ADVANTAGES AND DISADVANTAGES. IN EAST PROJECT, THE HEIGHT OF THE FULL SECTION-EXACAVTION IS ABOUT 9 M. AND IN THE WEST PROJECT THE HEIGHT IS AS LOW AS 5.5 M. IN THE WEST, DURING EXCAVATION, MORE TENSION WAS REQUIRED WHEN THERE WAS WATER LEAKAGE. THE WEST PROVED TO BE SUPERIOR TO THE EAST IN A PROGRESS SCHEDULE SINCE THE RATE OF EXCAVATION IS ABOUT THE SAME FOR PILOT DRIVING, EXTENDING EXCAVATION FOR FULL SECTION-DRIVING, AND UPPER HALF-EXCAVATION, WHILE THE LOWER HALF-EXCAVATION SHOWED PROGRESS.

  • Supplemental Notes:
    • pp 21-34, 11 FIG, 8 TAB, 10 PHOT
  • Authors:
    • Hachiya, Y
    • TAJIMA, T
  • Publication Date: 1969

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Filing Info

  • Accession Number: 00235836
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Dec 28 1970 12:00AM