ROCK BLASTING IN VIEW OF MATERIAL QUALITY AND THE NEED FOR STRENGTHENING MEASURES

BERGSPRAENGNING MED HAENSYN TILL BERGKVALITET OCH FOERSTAERKNINGSBEHOV

Careful rock blasting technique - according to the pre-split method or smooth surface blasting - is described, indicating many advantages over conventional rock blasting. Theories on the effects of various explosives and charges, hole diameters and spacings on the surrounding rock masses are presented. Formulae for calculation of total cost for smooth surface blasting are given and for a given example the difference compared to conventional rock blasting is 10 skr/m2 regardless of hole diameter. Pre-splitting is more expensive by 5 skr/m2. This increase is more than justified considering that no rock bolts or concrete linings are necessary. Even the easiest measures to strengthen the rock surface would mean more than twice the excess cost for smooth surface blasting. The poorer the quality of rock, the greater the difference will be. /TRRL/

• Authors:
  • Lundborg, N
• Publication Date: 1975

Language

• Swedish

Media Info

• Features: Figures; Photos; References; Tables;
• Pagination: 3 p.
• Serial:
  • Vaegnytt
  • Issue Number: 2

Subject/Index Terms

• TRT Terms: Holes; Improvements; Mass; Methodology; Presplitting (Blasting); Rockbolts; Rocks; Size; Strength of materials
• Uncontrolled Terms: Rock mass
• Old TRIS Terms: Hole size; Presplitting
• ITRD Terms: 5188: Blasting; 9108: Improvement; 9102: Method; 5147: Presplitting (rock); 4154: Rock
• Subject Areas: Construction; Geotechnology; Highways; I43: Rock Mechanics;

Filing Info

• Accession Number: 00133722
• Record Type: Publication
• Source Agency: Swedish National Road and Transport Research Institute (VTI)
• Files: ITRD, TRIS
• Created Date: Jun 23 1976 12:00AM