DEPENDENCE OF GROUND VIBRATIONS ON DISTANCE AND CHARGE DENSITY

MARKVIBRATIONERS AVSTAANDS OCH LADDNINGSBEROENDE

This report describes a research project concerning propagation of ground vibrations during blasting operations, the dependence of these on charge density and distance, and the way in which topography, the existence of tunnels and rock chambers, benches etc influence propagation of ground vibrations. Model tests and full-scale tests have been carried out. Analysis of a large number of vibration data provides a clear picture of the relationship between velocity of oscillations, distance and charge density. The reduction in vibration over a certain distance is greater than predicted by theory. Vibration at the ground surface is greater (by up to 5 times) than down in the rock at the same distance. In both bench and tunnel blasting, vibration is about the same behind and in front of a round. Tests on damping of vibrations by means of a gap (barrier trench) show that vibrations can be reduced to about 10% of the value without a gap. Proposals are given for criteria to be applied during repeated blasting. It is pointed out that results vary a lot owing to changes in rock properties, and that where scatter is large it may be necessary to make continuous measurements near sensitive installations. /TRRL/

  • Availability:
  • Corporate Authors:

    Swedish Council for Building Research

    St Goergansgatan 66, Box 27063
    S-11230 Stockholm,   Sweden 
  • Authors:
    • Lundborg, N
    • Holmberg, R
    • Persson, P A
  • Publication Date: 1978

Language

  • Swedish

Media Info

Subject/Index Terms

Filing Info

  • Accession Number: 00184485
  • Record Type: Publication
  • Source Agency: Transport and Road Research Laboratory (TRRL)
  • Report/Paper Numbers: Report 11 Monograph
  • Files: ITRD, TRIS
  • Created Date: Feb 3 1979 12:00AM