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DRILLING OF LARGE-DIAMETER PILES IN COMPRESSIBLE SOIL

FORAGE DE PIEUX DE GROS DIAMETRE DANS DES SOLS COMPRESSIBLES

This note outlines a method of repairing defective piles during the construction of the deep piled foundations of the saint-quentin viaduct. The foundations of the northern abutments consist of two piles driven in bentonite, sunk through 2,50M of various embankment materials, 6M of peat, and 2,50 to 3M of grey muddy silt. Following the occurrence of various disorders, an extremely rapid boring operation was carried out with thick bentonite to which cement had been added with a view to giving a better support to the walls. Non-destructive testing by ultrasonic methods showed defects. Two interpretations of the test results were put forward: (1) the ultrasonic beam went round the defect(s) and met only sound concrete; (2) the ultrasonic beam had to go through one or several layers of defective materials to go from the emission to the reception point. The latter assumption was selected as being the more probable. Eight boreholes were drilled around the pile and, in each cement grout (2 parts cement 1 part water) was injected. The injection was carried out over two metres on each side of the defect. After repair, ultrasonic testing detected no defects. /TRRL/

  • Corporate Authors:

    Laboratoire Central des Ponts et Chausees (LCPC)

    Boulevard Lefebvre 58
    Paris Cedex 15,   France  F-75732
  • Authors:
    • Lepissier, P
    • Cabarbaye, P
  • Publication Date: 1975-9-10

Language

  • French

Media Info

Subject/Index Terms

Filing Info

  • Accession Number: 00149684
  • Record Type: Publication
  • Source Agency: Central Laboratory of Bridges & Highways, France
  • Report/Paper Numbers: Analytic
  • Files: ITRD, TRIS
  • Created Date: Aug 4 1977 12:00AM