PRE-SPLITTING AND STRESS WAVES: A DYNAMIC PHOTOELASTIC EVALUATION

An experimental investigation was performed to evaluate the role of stress waves in the pre-splitting operation. 3D birefringent plexiglas models and the dynamic photoelastic technique were used to visualize the stress waves generated by the detonation. Simultaneous as well as sequential detonation of the explosive charges were investigated. The development of the fractures and stress waves were recorded using a high speed multiple spark gap camera of the Cranz-Shardin type. The experimental data were analyzed and displayed on a lagrangian diagram to present an overall picture of the entire dynamic event. It was repeatedly observed in the tests that the time required for the completion of the pre-splitting operation as practiced in the field is of the same order as that for the transit time for the stress waves between the blastholes thereby revealing the highly elastodynamic nature of the event. For the covering abstract of the symposium see TRIS 452576. (Author/TRRL)

• Supplemental Notes:
  • Proceedings of the 23rd Symposium on Rock Mechanics, Issues in Rock Mechanics, University of California, Berkeley, California, August 25-27, 1982.
• Corporate Authors:

  American Institute of Mining, Mettalurgy & Petroleum Engineers

  345 East 47th Street
  New York, NY  United States  10017
• Authors:
  • Simha, KRY
  • Holloway, D C
  • Fourney, W L
• Conference:
  • Proceedings of the 23rd Symposium on Rock Mechanics, Issues in Rock Mechanics, University of California, Berkeley, California, August 25-27, 1982.
• Publication Date: 1982

Media Info

• Features: Figures; Photos; References;
• Pagination: p. 523-530

Subject/Index Terms

• TRT Terms: Cinematography; Conferences; Dynamics; Elasticity (Mechanics); Evaluation; Explosives; Failure; Photoelasticity; Presplitting (Blasting); Rocks; Scale models; Stresses; Structural models; Tests; Waves
• Uncontrolled Terms: Stress waves
• Old TRIS Terms: Presplitting
• ITRD Terms: 5188: Blasting; 6752: Cinematography; 8525: Conference; 5473: Dynamics; 5912: Elasticity; 5520: Failure; 6205: Model (not math); 5147: Presplitting (rock); 4154: Rock; 5575: Stress (in material); 6255: Test; 6767: Wave
• Subject Areas: Bridges and other structures; Geotechnology; Highways;

Filing Info

• Accession Number: 00452596
• Record Type: Publication
• Source Agency: Transport Research Laboratory
• Files: ITRD, TRIS
• Created Date: Jul 31 1986 12:00AM