SPECIAL APPLICATION OF CAST-IN-PLACE WALLS FOR TUNNELS IN SOFT CLAY IN OSLO

TWO TUNNELLING PROJECTS IN OSLO ARE TO BE CONSTRUCTED TOGETHER OVER A LENGTH OF APPROXIMATELY 250 METERS THROUGH A DEEP CLAY-FILLED CANYON. THIS ARTICLE DESCRIBES THE SITE CONDITIONS AND DISCUSSES THE ALTERNATIVE SOLUTIONS WHICH HAVE BEEN CONSIDERED. THE CHOSEN METHOD IS BASED ON THE USE OF CAST-IN-PLACE WALLS WHICH ARE EXTENDED WELL BELOW THE EXCAVATION LEVEL, BUT WHICH DO NOT EXTEND TO ROCK AT THE DEEPEST SECTION. A SPECIAL FACTOR IN THIS PROJECT IS THAT THE LONGITUDINAL WALLS ARE STRUTTED BY DIGGING TRANSVERSE TRENCHES AND CASTING CROSS WALLS THEN FORM A STIFF SYSTEM OF RIBS BELOW THE LEVEL OF THE EXCAVATION SUCH THAT THE SHEAR STRENGTH BETWEEN THE CLAY AND THE CONCRETE WALLS PREVENT BOTTOM HEAVE. LATERAL MOVEMENTS OF THE WALLS AND SETTLEMENTS WILL BE SMALL, DUE TO THE STRUTS AS TRANSVERSE WALLS ARE PLACED BEFORE THE MAIN EXCAVATION IS STARTED. CASINGS WILL BE PALCED IN THE LONGITUDINAL WALLS FOR THE RAMMING OF STEEL PILES TO ROCK, AND THE PILING WILL BE DONE BEFORE THE MAIN EXCAVATION COMMENCES. /AUTHOR/

  • Authors:
    • EIDE, O
    • AAS, G
    • Josang, T
  • Publication Date: 1972

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  • Accession Number: 00236410
  • Record Type: Publication
  • Files: TRIS
  • Created Date: May 29 1973 12:00AM