GROUND VIBRATIONS FROM TUNNEL BLASTING

THIS ARTICLE DEALS WITH THE MEASUREMENT AND CHARACTER OF GROUND VIBRATIONS CAUSED BY BLASTING A 12FT DIAMETER PILOT TUNNEL THROUGH SANDSTONE AS A PRELIMINARY OPERATION IN THE CONSTRUCTION OF THE SECOND MERSEY ROAD TUNNEL. THE BASIC PROPERTIES OF A GROUND WAVE ARE SHOWN TO BE THE FREQUENCY AND AMPLITUDE. THE FREQUENCY IS DEPENDENT ON THE TYPE OF GROUND WHILE THE AMPLITUDE DEPENDS ON THE WEIGHT OF EXPLOSIVE CHARGE, THE GROUND TYPE, AND THE DISTANCE FROM THE BLAST. A FORMULA FOR PREDICITING THE AMPLITUDE OF VIBRATION, FIRST DEVELOPED BY MORRIS, IS SHOWN TO BE INACCURATE AT SHORT DISTANCES AND A MODIFICATION IS DEVELOPED. A COMPARISON IS MADE OF VIBRATIONS IN THE BEDROCK AND IN THE CLAY OVERBURDEN, AND THE EFFECT OF USING SHORT DELAY DETONATIORS INSTEAD OF HALF-SECOND DETONATORS IS OBSERVED. THE EFFECT OF GROUND VIBRATIONS ON BUILDINGS IS DESCRIBED AND A CRITERION OF DAMAGE IS GIVEN, I.E. THE LEVEL OF VIBRATION ABOVE WHICH DAMAGE TO A STRUCTURE WILL RESULT. APART FROM A LIMIT ON THE WEIGHT OF EXPLOSIVE FIRED TO PREVENT DAMAGE TO A STRUCTURE, IT IS SHOWN THAT THE WEIGHT MUST ALSO BE LIMITED WITH CONSIDERATION FOR HUMAN REACTION TO THE BLASTING IF DOMESTIC RESIDENCES ARE NEARBY. IT IS SHOWN THAT A LOWER CRITERION MUST BE ADOPTED IN SUCH CASES TO PREVENT SEVERE NUISANCE. /RRL (A)/

  • Availability:
  • Supplemental Notes:
    • Vol 2, No 3, PP 141-144, 4 FIG, 8 REF
  • Authors:
    • Davies, T V
  • Publication Date: 1970-5

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Filing Info

  • Accession Number: 00235147
  • Record Type: Publication
  • Source Agency: Road Research Laboratory /UK
  • Files: TRIS
  • Created Date: Aug 29 1971 12:00AM