Search for dissertations about: "blast fragmentation"

Showing result 1 - 5 of 9 swedish dissertations containing the words blast fragmentation.

  2. 1. Burden Dynamics and Fragmentation

    Author : Nikolaos Petropoulos; Zongxian Zhang; Luleå tekniska universitet; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Mining and Rock Engineering; Gruv- och berganläggningsteknik;

    Abstract : Drill and blast is a dominant technique in several surface and underground mines in the world. The purpose of this technique is to break rock mass into fragments, which can be handled by mining equipment. The identified major influencing factors in rock blasting are stress waves and gas pressurization. READ MORE

  4. 2. Fragmentation and waste rock compaction in small-scale confined blasting

    Author : Daniel Johansson; Luleå tekniska universitet; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Mining and Rock Engineering; Gruv- och berganläggningsteknik;

    Abstract : Sub-level caving (SLC) is an important mass mining method, used at LKAB e.g. The caved rock or debris at the SLC interface reduces the fragmentation and the swelling of the blasted ring and it dissipates the explosive energy. These phenomena may immobilize the blasted ring, causing ore losses. READ MORE

  5. 3. Improved understanding of sublevel blasting : Determination of the extent of the compacted zone, its properties and the effects on caving

    Author : Nikolaos Petropoulos; Daniel Johansson; Luleå tekniska universitet; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; sublevel mining; compaction; confining material; confined blast; impact tests; burden dynamics; coarse-grained material; Mining and Rock Engineering; Gruv- och berganläggningsteknik;

    Abstract : Sublevel caving (SLC) is a mass mining method relying on the flowability of the blasted material. The ore is blasted in slices against caved material which is mainly waste rock. The result of the confined blast is greatly influenced by the interaction between the blasted material and the caved material. READ MORE

  6. 4. Dynamic Behaviour of Concrete Structures subjected to Blast and Fragment Impacts

    Author : Joosef Leppänen; Chalmers tekniska högskola; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY;

    Abstract : For protective structures, reinforced concrete is commonly used. Concrete structures subjected to explosive loading in a combination of blast and fragments will have very different response than statically loaded structure. READ MORE

  7. 5. Effects of confinement and initiation delay on fragmentation and waste rock compaction : Results from small scale tests

    Author : Daniel Johansson; Gideon Chitombo; Luleå tekniska universitet; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Mining and Rock Engineering; Gruv- och Berganläggningsteknik;

    Abstract : Sub-level caving (SLC) is classified as a mass mining method and there is an increasing interest in its application worldwide and in a very wide range of geotechnical environments. Design of sub-level blasting rounds and optimization has become more important now when the sizes of the blasting rings have become larger. READ MORE