First International Symposium on
ROCK FRAGMENTATION BY BLASTING Lulea, Sweden, August 23-26,1983
UB/TIB Hannover 117 715 875
Volume No. 3.
89
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VOLUME No. 1 - 3 TABLE OF CONTENTS Page Volume
Welcome to Lulea University of Technology. Vice Chancellor Dr Torbjb'rn Hedberg
815
3
Opening of the Symposium and Introduction. Dr Per-Anders Persson, Chairman of the organizing committe
•817
3
Key-note. Fragmentation - a Review. Disintegration of solids. Ulf Langefors, Sweden
819
3
Gaps in the Field of Fragmentation by Blasting and some Thoughts about Future Research and Development. Agne Rustan, Sweden
827
3
Blasting Experiments in the Luossavaara Research Mine. Torbjorn Naartijarvi, Sweden
839
3
Discussion
855
3
KEY-NOTE SESSION
Session 1. IMPORTANT PARAMETERS FOR ROCK FRAGMENTATION Chairman: C M . Lownds, vice chairman: Agne Rustan * A Study of Bench Blasting in Rhyoporphyry at a Reduced Scale and the Statistical Analysis of the Regularity for Fragmentation Distribution. Ma Bailing et al, China
857
Production Drilling with high Accuracy. Lars Hermansson, Sweden
789
Energy in Fragmentation. Per-Anders Persson, Sweden
777
Discussion 1
873
Measurements and Predictions of Borehole Pressure Variations in Model Blasting Systems. F.O. Otuonye et al, USA
7
The Effect of Charge Cavity Ratio on Rock Breaking. Zhu Rui-Geng et al, China.
21
The Influence of Controllable Blast Parameters on Fragmentation and Mining Costs. T.N. Hagan, Australia
31
Discussion 2
875
Page
Volume
The Role of Stress Waves in Explosively Induced Bulk Rock Motion. J.N. Edl, USA.
53
1
Effect of Explosive Properties, Rock Type and Delays on Fragmentation in Large Model Blasts. O.R. Bergmann, USA.
71
1
On the Applicability of the Tensile Strength as an Index to Rock Fragmentation. Kenneth Maki, Sweden
79
Dynamic Photoelastic Studies on Delayed Pre-split Blasting. K.R.Y. Simha et al, USA
97
The Influence from Specific Charge, Geometric Scale and Physical Properties of Homogenous Rock on Fragmentation. Agne Rustan et al, Sweden
115
Regulations of the Process of Hard Rocks Fragmentation by Blasting. K.A. Dolgov, USSR.
143
Discussion 3
876
3
Spallation, Break-Up and Separation of Layers by Oblique Stress-Wave Interaction. H.P. Rossmanith et al, Austria
149
1
Theoretical Research and Modelling of Directed Crack Propagation in Borehole Blasting. A.L. Isakov et al, USSR.
169
1
Model Studies on Explosively Driven Cracks under Confining In-situ Stresses. K.R.Y. Simha et al, USA
183
1
New Methods of Measuring Fracture Toughness on Rock Cores. F. Ouchterlony et al, Sweden
199
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Discussion 4
883
3
225
1
Session 2. THEORY OF FRACTURING AND CRACK PROPAGATION Chairman: W.L. Fourney, vice chairman: Agne JRustan
Session 3. INSTRUMENTAL SYSTEMS FOR EVALUATION OF FRAGMENTATION Chairman: Dinis da Gama, vice chairman: Gunnar Almgren Rock Fragmentation by Explosives. Stephen R. Winzer et al, USA
Page
Volume
The Development Concept of the Integrated Electronic Detonator. Paul N. Worsey et al, USA
251
1
The Measuring Equipment and the Technique of Particle Velocity - at Investigation of Dynamic Rock Constitutive Equation In-situ. Wang Wu-Ling et al, China
259
1
Interaction between Blast Design Variables; Experimental and Modelling Studies. J.J. Dawes et al, Australia
265
1
Electromagnetic Velocity Gauge Measurement of Rock Mass-Motion during Blasting . Chapman Young et al, USA.
289
1
Discussion 5
885
Increasing Productivity through Field Control and High-Speed Photography. R. Frank Chiappetta et al, USA
301
A Method for Estimation of Fragment Size Distribution with Automatic Image Processing. Olle Carlsson et al, Sweden
333
Instrumented Model Scale Blasting in Concrete. Gert Bjarnholt et al, Sweden
799
Discussion 6
889
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Session 4. FEM AND FINITE DIFFERENCE-CODES Chairman: Gwynn Harries, vice chairman: Per-Anders Persson Numerical Simulation of Fracture and Fragmentation. L.G. Margolin et al, USA
347
Simulation of Rock Blasting with the Shale Code. T.F. Adams et al, USA
361
Numerical Modelling of Rock Fragmentation. S. Valliappan et al, Australia
375
Computer Simulation of Blast—Induced Vibration, Fracture and Fragmentation processes in Brittle Rocks. Peter Digby et al, Sweden
393
Computational Simulations of Dynamically induced Fracture and Fragmentation. Stuart McHugh, USA
407
Discussion 7
893
Session 5. MATHEMATICAL MODELS FOR BiAST AND FRAGMENTATION PREDICTIONS Chairman: L.G. Margolin, vice chairman: Roger Holmberg
Page
Volume
Rock Displacement Velocity during a Bench Blast. R.F. Favreau, Canada
753
2
The modelling of Long Cylindrical Charges of Explosive. Gwynn Harries, Australia
419
2
The Kuz-Ram Model for Prediction of Fragmentation from Blasting. C.V.B. Cunningham, South Africa
439
2
Discussion 8
899
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Computer Modelling of Fragmentation from an Array of Shotholes. C M . Lownds, South Africa
455
2
Some Ideas on how to Improve Calculations of the Fragment Size Distribution in Bench Blasting . Hans Hjelmberg, Sweden.
469
2
Differentiated Blasting Technique for Optimum Fragmentation at Aitik Copper Mine. A case study. Gustaf Tham, Sweden ,
495
2
Fragmentation in Jointed Rock Material. W.L. Fourney et al, USA
505
2
Influence of Joints on Rock Blasting. A Model Scale study. D.P. Singh et al, India
533
2
Influence of Structural Geology on Controlled Blasting in Sedimentary Rocks - Case History. Goran Lande, USA
555
2
Discussions 9
903
3
Use of Comminution Theory to Predict Fragmentation of Jointed Rock Masses Subjected to Blasting. Dinis da Gama, Brazil
565
2
The influence from Primary Structure on Fragmentation. Yang Zu Guang et al, Sweden
581
2
Experimental Investigation of Dynamic Surface Response to Explosive Loading. David C Holloway et al, USA
605
2
Discussions 10
905
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Session 6. INFLUENCE OF JOINT AND ROCK STRUCTURE ON FRAGMENTATION Chairman: Calvin J. Konya, vice chairman: Lennart Ottosson
Session 7. COST ANALYSES OF THE SYSTEM OF DRILLING, BLASTING, MUCKING, CRUSHING AND TRANSPORTATION Chairman: Stephen R. Winzer, vice chairman: Ingemar Marklund
Page
Volume
Electric Shovel Performance as a Measure of Blasting Efficiency. S.R. Williamson et al, Australia
625
2
Development of a Fragmentation Monitoring System for Evaluating Open Stope Blast Performance at Mount Isa Mines. J.R.T. Grant et al, Australia
637
2
The Precision of Long Hole Drilling with Modern Machines in Mining Operations. Angelo Medda et al, Italy
665
2
Discussions 11
907
3
Sublevel Stoping in Strassa Mine. Kurt Gustafsson, Sweden
685
2
Energy Requirements of Rock Breaking in Mining Operations; Considerations and Proposals. Pier Paolo Manca et al, Italy
705
2
Accurate Bench Drilling Aids - for Better Overall Economy . Bjb'rn Karlsson, Sweden.
725
2
Sources of Error in Long Hole Drilling their Consequences and how to avoid them. Per-Erik Lindvall, Sweden
739
2
The Effect of Blasting on the Grade of Ore Crushing.
909
3
Discussions 12
912
3
PANEL DISCUSSION
915
3
Opening of the panel discussion. Roger Holmberg
915
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Part 1. The Organization of International Blasting Research and Standardization. Moderator: Agne Rustan Part 2. New Developments in Technique to Control Fragmentation and Their Impact on Modern Mining and Construction Engineering. Moderator: Roger Holmberg
917
3
918
3
Optimization of Open Pit Bench Blasting. Kai Nielsen, Norway
S.D. Victorov, USSR
Page
Volume
A New Technique for Controlled Small-Scale Hydraulic Fracturing. J.J. Kolle, USA
921
3
Errata Sheet
937
3
List of Participants
939
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