CONTROL, MANAGEMENT AND USE OF EXPLOSIVES FOR ROCK AND QUARRY EXCAVATIONS

Explosives apply a steep-pointed pressure pulse to the rock surface generating a compressive strain pulse. When the strain pulse reaches a free surface it is reflected as a tensile wave which is more effective since rock is nearly ten times weaker in tension than in compression. The author discusses the regulations covering procurement, conveyancing and storage of explosives. Commercial explosives are divided into three groups: nitroglycerine and ammonium nitrate/fuel oil based explosives and slurries. Hole diameters used are dependent on the type of explosive. A quadrogram is given to assist in the determination of the ideal combinations of blasting ratio, length of explosive column, the depth of burden and the theoretical yield of rock per hole. Alternative types of initiation procedures are examined and the merits of each type are discussed. The principles of operation of a new non-electric system, nonel, is outlined. Recommendations are given for maximum particle velocities to be permitted in given environmental conditions. Comparison of costs for the different methods is difficult; the author indicates how costs can increase depending on the nature of the work and the conditions. (TRRL)

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/issn/01426168
• Corporate Authors:

  Embankment Press Limited

  Crown House, 60 North Circular Road
  London NW10,   England 
• Authors:
  • Sen, G C
• Publication Date: 1981-12-19

Media Info

• Features: Figures; Photos; References;
• Pagination: p. 7
• Serial:
  • Highway and Public Works
  • Volume: 49/5
  • Publisher: Embankment Press Limited
  • ISSN: 0142-6168

Subject/Index Terms

• TRT Terms: Boreholes; Costs; Excavation; Excavations; Explosives; Legislation; Methodology; Presplitting (Blasting); Quarries; Rocks; Safety
• Geographic Terms: United Kingdom
• ITRD Terms: 5188: Blasting; 224: Cost; 5155: Excavation (process); 1556: Legislation; 9102: Method; 5124: Quarry; 4154: Rock; 1665: Safety; 8119: United Kingdom
• Subject Areas: Construction; Finance; Geotechnology; Highways; Law; Safety and Human Factors; I36: Aggregates; I43: Rock Mechanics;

Filing Info

• Accession Number: 00362309
• Record Type: Publication
• Source Agency: Transport Research Laboratory
• Report/Paper Numbers: No. 1860/1861
• Files: ITRD, TRIS
• Created Date: Oct 30 1982 12:00AM