Charakterisierung der Leistungsfähigkeit von ANFO- und Emulsionssprengstoffen mit Hilfe von großen Zylinderexpansionsversuchen
2003 (German)In: Berg- und Huttenmännische Monatshefte (BHM), ISSN 0005-8912, E-ISSN 1613-7531, Vol. 148, no 6, 231-238 p.Article in journal (Refereed) Published
Cylinder expansion tests have been made in order to measure the working capacity of commercial explosives under standardized but realistic conditions. Copper tubes, O 110/100 mm diameter, filled with ANFO or bulk emulsion explosives were detonated, the VOD and the tube wall expansion measured. From this the work capacity in terms of the Gurney energy EG, i.e. kinetic energy of tube and explosive gases, was calculated. Pure ANFO gave values of 1.6-1.9 MJ/kg, aluminised ANFO 2.5 MJ/kg and bulk emulsion 1.5-2.3 MJ/kg depending on the density. The explosive energy transfer is basically over at a volume expansion ratio of 5-10, but the aluminised ANFO keeps doing work much longer. Compared with their explosion energies however, the ANFO explosives transferred only 40-50 % of the available energy but the emulsion 60-70 % at normal densities. At densities above 1200 kg/m3, the VOD of the emulsions tends to drop off but the work capacity continues to increase. It is best described as a linearly increasing function with density. The case is finally made that the cylinder test is a better way to emulate rock-blasting conditions than the underwater test. It stops doing work at a relevant expansion ratio of the blast fumes and it has a reasonable balance between the different energies that accompany the blasting process. It can cope with charge sizes that are relevant for commercial explosives.
Place, publisher, year, edition, pages
2003. Vol. 148, no 6, 231-238 p.
Civil engineering and architecture - Geoengineering and mining engineering
Samhällsbyggnadsteknik och arkitektur - Geoteknik och gruvteknik
Research subject Mining and Rock Engineering
IdentifiersURN: urn:nbn:se:ltu:diva-6396Local ID: 4a047840-891f-11db-8975-000ea68e967bOAI: oai:DiVA.org:ltu-6396DiVA: diva2:979281
Validerad; 2003; 20061211 (ysko)2016-09-292016-09-29Bibliographically approved