NEW LOGGING FOR EXPLORATORY BORING BY MEANS OF ULTRASONIC WAVE REFLECTION

UNE NOUVELLE DIAGRAPHIE DES SONDAGES PAR REFLEXION ULTRASONIQUE

The reflection of ultrasonic short waves on the sides of soil formations gives echo characteristic of their acoustic impedance. The reflected intensity can be related to the velocity of sound, and the density and porosity of reflecting layers. A measuring probe, to which a transducer and an electronic system for picking the signals have been attached, was developed for investigating shaft walls. A computer program was written for interpreting the measurements. It takes into account the theoretical relations, which define the principles of the method and the data characteristics of the materials encountered. The ultrasonic reflection charts obtained for two shafts, translated into porosity as a function of the levels, are correlated with standard nuclear porosity logging and laboratory measurements or cores taken from those shafts. The comparative results are very satisfactory. It was also shown that the signal received is a function of the permeability. /TRRL/

  • Corporate Authors:

    Societe de Editions Technip

    27 rue Ginoax
    75737 Paris 15,   France 
  • Authors:
    • Norel, G
    • Desbrandes, R
  • Publication Date: 1973-7-8

Language

  • French

Media Info

  • Features: Figures; Photos; References; Tables;
  • Pagination: p. 587-604
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00128140
  • Record Type: Publication
  • Source Agency: Central and Regional Labs of Bridges & Highways,Fr
  • Files: ITRD, TRIS
  • Created Date: Apr 21 1976 12:00AM