Cautious Blasting in Urban Areas Cautious Blasting in Urban Areas Society for Rock Mechanics & Engineering Geology Singapore, 07-12-2012 By Sjoerd Spijkerman Opening Blast by Speaker About the Company  Swedish company in the field of tunneling and surface rock works  Specialized in rock engineering/ cautious blasting in urban areas  Network of associated companies working together in larger projects Following Services  Blasting consultancy (charge calculation, drilling design, vibration monitoring, production sequence design, air- shock wave calculation)  Blasting services (drilling and blasting, rock and concrete fracturing)  Engineering geological services (engineering geological design and calculation, rock support)  Planning, cost estimates/cost control  Quality checks (analysis and design followups)  Geological services (mapping bed-rock, tunnel mapping, groundwater studies)  Construction management Seminar topics  General blasting issues  Bench blasting / Tunnel blasting  Vibration monitoring  Alternative methods  Example: City Link railway project Cautious & Smooth Blasting  Cautious blasting: blasting without causing damage to the environment  Smooth blasting: blasting without causing damage to the remaining rock ”A great difficulty when it comes to determining the limit values for varying degrees of damage is due to the fact that there have been relatively few cases where damages could be proved” From Modern technique of rock blasting by Langefors and Kihlström, 1963 Common Blasting Projects in Urban Areas High Priced Ground  Foundation for building/construction/bridge projects  Removing roads/railroads subsurface  Removing cables/pipelines/sewer/drainage into tunnels  Free surface ground for housing/offices, build below (storage, sporting arenas, parking, shopping)  Cooling/heating plants Conclusion: blasting is getting more complicated Basics on Blasting  Preparation works (permits, design, calculations, planning, time-cost estimates)  Drilling  Charging and detonation design  Firing and safety control  Mucking  Cleaning and scaling  Rock support  Analyse of blasting procedure Most Important: Geology Bild från ”modern sprängteknik”