Sökning: "Rock fragmentation"

Visar resultat 11 - 15 av 35 avhandlingar innehållade orden Rock fragmentation.

  1. 11. Fragmentation and waste rock compaction in small-scale confined blasting

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

    Sammanfattning : 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. LÄS MER

  3. 12. Fracture analysis of cracks related to rock fragmentation

    Författare :Finn Ouchterlony; []
    Nyckelord :;

    Sammanfattning : .... LÄS MER

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

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

    Sammanfattning : 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. LÄS MER

  5. 14. New hard rock fragmentation formulas based on model and full-scale tests

    Författare :Nie Shu Lin; Luleå tekniska universitet; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Mining and Rock Engineering; Gruv- och Berganläggningsteknik;

    Sammanfattning : .... LÄS MER

  7. 15. Modelling of drill string buckling and tool indentation in rock drilling and fragmentation

    Författare :Xiangchun Tan; Luleå tekniska universitet; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Mining and Rock Engineering; Gruv- och Berganläggningsteknik;

    Sammanfattning : In rock drilling, quality of drill hole and efficiency of drilling are two important aspects of great concern to drill operators and manufacturers. The first part of the thesis deals with the deviation of blast holes. LÄS MER