Sökning: "Sublevel caving"

Visar resultat 11 - 15 av 16 avhandlingar innehållade orden Sublevel caving.

  1. 11. Mining induced seismicity in Sweden

    Författare :Kristina Larsson; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Mining and Rock Engineering; Gruv- och Berganläggningsteknik;

    Sammanfattning : The virgin stress state in the rock mass is disturbed by mining, which leads to locally increased or decreased stresses. The rock mass in Sweden is generally composed of high strength brittle rock types, so the risk of seismicity and rockbursts (violent failures) increase with increasing depth of mining due to increasing stress levels. LÄS MER

  3. 12. Rock Mass behavior and Cap Rock Stability at the Malmberget Mine

    Författare :Sraj Banda Umar; Christer Andersson; Luleå tekniska universitet; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Mining and Rock Engineering; Gruv- och berganläggningsteknik;

    Sammanfattning : Rock Mass behavior and Cap Rock Stability at the Malmberget MineThe LKAB Malmberget mine is mined using sublevel caving. This mining method requires continuous caving of the hangingwall, which also result in ground deformations on the surface. LÄS MER

  4. 13. Lastningssystem i brytningsfront för kontinuerliga bergflöden under jord

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

    Sammanfattning : There is a demand in mining for more investments in continuous loading methods in order to achieve higher productivity and lower costs. The creation of a better environment is another major goal which could be attained by using remote or automatic control of the continuously working machines. LÄS MER

  5. 14. Rock Evaluation Using Digital Images and Drill Monitoring Data : Before and after rock blasting

    Författare :Sohail Manzoor; Anna Gustafson; Håkan Schunnesson; Daniel Johansson; Philipp Hartlieb; Luleå tekniska universitet; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Measurement while drilling; Photogrammetry; Rock fragmentation; Gruv- och berganläggningsteknik; Mining and Rock Engineering;

    Sammanfattning : This research is carried out to better understand the nature of the rock mass and to have a better anticipation of rock fragmentation before blasting the rock mass. Current practices of assessing rock mass usually involve techniques that focus on the surface or outcrop of the rock mass such as scanline surveys, window surveys, photogrammetry and laser scanning etc. LÄS MER

  7. 15. Burden Dynamics and Fragmentation

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

    Sammanfattning : 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. LÄS MER