SAFE ROCK BLASTING

FOERSIKTIG SPRAENGNING

The technique of blasting rock without causing harmful effects on surrounding buildings or other objects is described. The theory of wave propagations in rock is presented briefly. Tables are given showing: 1. The risk of damage in ordinary housing areas with reference to particle-motion velocity and type of rock. 2. Reducing factors for different types of detonators. 3. Recommended charge depending on distance to endangered object. Buildings with electrical installations such as relay devices, computers and automatic switchboards must be particularly considered. These devices are extremely sensitive to the acceleration of vibrations. Recommended maximum amplitudes and accelerations for continous or intermittent vibrations are given for IBM computers. These restrictions necessitate a maximum charge of 250 times less than that permissible for the building itself. For economic reasons this cannot be done. As an alternative a method of moderating the vibrations reaching the computers has been developed. These are put on rubber dampers and thereafter will withstand the same vibrations as the building. The planning and execution of a pilot project is described and also the measuring equipment used. See also IRRD abstract no. 214777. /TRRL/

  • Corporate Authors:

    Swedish Geotechnical Institute

    Banergaten 16
    S-115-26 Stockholm,   Sweden 
  • Authors:
    • Ljung, B
  • Publication Date: 1974

Language

  • Swedish

Media Info

  • Features: Figures; Photos; Tables;
  • Pagination: 18 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00128126
  • Record Type: Publication
  • Source Agency: Swedish National Road and Traffic Research Institute
  • Report/Paper Numbers: No. 56 Conf Paper
  • Files: ITRD, TRIS
  • Created Date: Feb 19 1981 12:00AM