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Compaction of confining materials in pillar blast tests
Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Geoteknologi.ORCID-id: 0000-0001-8564-3694
LKAB, Kiruna.
Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Geoteknologi.ORCID-id: 0000-0002-5165-4229
Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Geoteknologi.ORCID-id: 0000-0002-9766-0106
2018 (engelsk)Inngår i: Rock Mechanics and Rock Engineering, ISSN 0723-2632, E-ISSN 1434-453X, Vol. 51, nr 6, s. 1907-1919Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

Two confined pillar tests were conducted at the Kiirunavaara mine to investigate the degree of compaction of three materials, i.e., 0–32-mm backfilled material, a blend of ore and waste material and caved material. Two blastholes were drilled parallel to each pillar wall, and several measurement holes were drilled in between the blastholes through each pillar. Both the measurement holes and backfilled materials, except the caved material, were instrumented. Two types of measurements were taken: dynamic measurements with accelerometers, and static measurements which considered the location of the instrumentation pre- and post-blast. Dynamic measurements involved the burden movement and the confining material behavior, and static measurements contained the final location of sensors inside and the angle of repose of the confining material. The results showed that the size distribution of the confining material affects its behavior under dynamic loading. The backfilled materials showed an apparent cohesion forming an agglomeration on the surface of the blasted burden. The burden moved as one slab due to simultaneous detonation. A gap was formed between the blasted burden and the new face. This gap was partially filled with burden erosion material which was finer fragmented than the blasted burden material.

sted, utgiver, år, opplag, sider
Springer, 2018. Vol. 51, nr 6, s. 1907-1919
Emneord [en]
Compaction, burden movement, pillar tests, sublevel caving, confined blasting
HSV kategori
Forskningsprogram
Gruv- och berganläggningsteknik
Identifikatorer
URN: urn:nbn:se:ltu:diva-67850DOI: 10.1007/s00603-018-1447-8ISI: 000433195900016Scopus ID: 2-s2.0-85047517598OAI: oai:DiVA.org:ltu-67850DiVA, id: diva2:1187849
Prosjekter
Improved understanding of sublevel blasting – Determination of the extent of the compacted zone, its properties and the effects on caving
Merknad

Validerad;2018;Nivå 2;2018-06-01 (rokbeg)

Tilgjengelig fra: 2018-03-06 Laget: 2018-03-06 Sist oppdatert: 2022-06-30bibliografisk kontrollert

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Petropoulos, NikolaosJohansson, DanielNordlund, Erling

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