GROUND VIBRATIONS FROM TUNNEL BLASTING, EXPERIENCE FROM BLASTING 12 FT DIAMETER MERSEY PILOT TUNNEL

THE MEASUREMENT AND CHARACTER ARE DESCRIBED OF GROUND VIBRATIONS CAUSED BY BLASTING A 12 FT DIAMETER PILOT TUNNEL THROUGH SANDSTONE 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 PREDICTING 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 DETONATORS 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. /AUTHOR/

  • Availability:
  • Supplemental Notes:
    • Vol 2, No 3, PP 141-144
  • Authors:
    • Davies, J V
  • Publication Date: 1970-5

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  • Accession Number: 00215291
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Aug 3 1970 12:00AM