Sökning: "Fracturing"

Visar resultat 16 - 20 av 57 avhandlingar innehållade ordet Fracturing.

  1. 16. New developments in hydrofracturing stress measurement techniques and a comparison to the HTPF method

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

    Sammanfattning : This thesis describes two hydraulic methods for rock stress measurements; hydraulic fracturing and hydraulic tests on pre-existing fractures (the HTPF method). It includes theories to evaluate stress field information for somewhat extraordinary stress and field situations, experimental investigations and field measurements. LÄS MER

  3. 17. Investigation of the correlation of fracture frequency and electric resistivity in impact craters in crystalline rocks

    Författare :Ann Bäckström; KTH; []
    Nyckelord :Electric resistivity; Fracture frequency; Impact generated fractures; Electro-magnetic techniques; VLF-R method; MT method; Window-mapping technique; Three-dimensional fracture calculations; heat-exchange structure; geothermal energy;

    Sammanfattning : Impact craters are formed when a large meteorite or comethits the Earth. At the impact a shock wave is released causingabundant fracturing in the surrounding bedrock. This type offracturing is intense and occurs throughout a very large volume(>100 km3) of the bedrock. LÄS MER

  4. 18. Predominant failure mechanisms at the Kiirunavaara mine footwall

    Författare :Mikael Svartsjaern; Diego Mars Ivars; Luleå tekniska universitet; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Mining and Rock Engineering; Gruv- och berganläggningsteknik;

    Sammanfattning : The Luossavaara-Kiirunavaara Aktiebolag (LKAB) Kiirunavaara mine is a large scale sub-level caving (SLC) mine in northern Sweden. The use of SLC as a mining method inherently causes significant rock mass movements above the extraction level. LÄS MER

  5. 19. Fluid Governance : Scalar politics in the South African waterscape

    Författare :Vasna Ramasar; LUCSUS; []
    Nyckelord :SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; governance; scale; water; politics;

    Sammanfattning : This thesis offers a critical analysis of the scaling of water governance in South Africa and its implications for water access and allocation. As the complexity and severity of environmental problems increases, there is a growing tendency to look to environmental governance to offer solutions. LÄS MER

  7. 20. New developments of the Integrated Stress Determination Method and application to the Äspö Hrad Rock Laboratory, Sweden

    Författare :Daniel Ask; KTH; []
    Nyckelord :Integration; Rock Stress; ISDM; Äspö HRL;

    Sammanfattning : This thesis presents new developments of the IntegratedStress Determination Method (ISDM) with application to the AspoHard Rock Laboratory (HRL), Oskarshamn, Sweden. The newdevelopments involve a 12-parameter representation of theregional stress field in the rock mass. LÄS MER