GEOPHYSICAL BOREHOLE LOGS AS AN AID TO GROUND ENGINEERING

DETAILS ARE GIVEN OF AN ACOUSTIC BOREHOLE PROBE, KNOWN COMMERCIALLY AS THE 3D VELOCITY LOGGER, WHICH CONTINUOUSLY RECORDS COMPRESSION AND SHEAR WAVE TRANSIT TIMES AND BULK DENSITY; FROM THESE DATA, DYNAMIC VALUES OF YOUNG'S, SHEAR, BULK AND DEFORMATION MODULUS, POISSON'S RATIO AND POROSITY CAN BE COMPUTED. THE BOREHOLE TOOL CONTAINS A TRANSMITTER AND A RECEIVER WHICH DETECTS THE SIGNAL FROM THE TRANSMITTER AFTER IT HAS BEEN PROPAGATED THROUGH THE FORMATION SURROUNDING THE BOREHOLES. THE TOOL MUST BE RUN IN A FLUID FILLED HOLE TO PROVIDE COUPLING FOR THE SIGNAL. THE SIGNALS ARE MONITORED AT THE SURFACE BY AN AMPLITUDE MODULATED OSCILLOSCOPE, AND, AT THE SAME TIME, RECORDED ON FILM THROUGH A FIBER OPTICS SYSTEM WHICH ALLOWS INTENSITY MODULATION OF THE OSCILLOSCOPE BEAM. /TRRL/

  • Corporate Authors:

    Ground Engineering

    7 Ongar Road
    Brentwood CM15 9AU,   England 
  • Authors:
    • KENNETT, P
  • Publication Date: 1971-9

Media Info

Subject/Index Terms

Filing Info

  • Accession Number: 00230123
  • Record Type: Publication
  • Source Agency: Transport and Road Research Laboratory (TRRL)
  • Files: TRIS
  • Created Date: Jul 17 1972 12:00AM