SOIL - ROCK DRILLING AND ROCK LOCATING BY ROCK INDICATOR

A NEW METHOD IS PRESENTED OF DETERMINING THE LEVEL OF BEDROCK SURFACE, WHEN IT IS COVERED BY SOIL. THE METHOD COMPRISES DRILLING THROUGH SOIL INTO ROCK /SOIL-ROCK DRILLING/, IN COMBINATION WITH MONITORING THE DRILLING SOUND FROM THE WORKING OF THE DRILL BIT IN THE ROCK. FOR SOUND MEASUREMENT A MICROPHONE IS PLACED IN A BOREHOLE INTO SOLID ROCK. THE SOUND IS LISTENED TO BY HEAD-PHONES AND READ ON A METER, AND CAN BE RECORDED. THE SOUND MEASUREMENT CAN DISTINGUISH BETWEEN BOULDERS AND ROCK EVEN WHEN LARGE BOULDERS LIE CLOSE TO THE ROCK SURFACE. WITH ONE LISTENING POINT AN AREA ABOUT 100 METERS IN RADIUS CAN BE COVERED. THE REACH IS DEPENDENT ON THE SIZE OF THE ROCK DRILL AND QUALITY OF THE ROCK. GOOD RESULTS HAVE BEEN ACHIEVED IN BOTH ERUPTIVE /GRANITE AND GNEISS/ AND SEDIMENTARY /LIMESTONE AND SANDSTONE/ ROCKS. /AUTHOR/

  • Supplemental Notes:
    • Vol 1, pp 69-72, 8 FIG, 4 PHOT, 3 REF
  • Corporate Authors:

    Butterworth & Company Ltd, London /UK

    /4th Conf
    ,   United States 

    N/A

    ,   United States 

    Western Australia University, Australia

    Nedlands, Western Australia,   Australia 

    National Belgian Roads Congress

    ,    

    Pca Foreign Literature Study

    ,    
  • Authors:
    • Lundston, R
    • Stenberg, R
  • Conference:
  • Publication Date: 0

Media Info

  • Serial:
    • Volume: 2

Subject/Index Terms

Filing Info

  • Accession Number: 00228811
  • Record Type: Publication
  • Source Agency: CANADIAN GOOD ROADS ASSOCIATION
  • Files: TRIS
  • Created Date: Aug 15 2004 2:37AM