Search for dissertations about: "fracture mapping"

Showing result 1 - 5 of 18 swedish dissertations containing the words fracture mapping.

  2. 1. Novel methods for 3-D semi-automatic mapping of fracture geometry at exposed rock faces

    Author : Quanhong Feng; KTH; []
    Keywords : 3-D laser scanner; close-range photogrammetry; engineering geology; fracture geometry; fracture mapping; rock engineering; rock faces; rock mechanics; three-dimension; total station;

    Abstract : To analyse the influence of fractures on hydraulic andmechanical behaviour of fractured rock masses, it is essentialto characterise fracture geometry at exposed rock faces. Thisthesis describes three semi-automatic methods for measuring andquantifying geometrical parameters of fractures, and aims tooffer a novel approach to the traditional mapping methods. READ MORE

  4. 2. Investigation of the correlation of fracture frequency and electric resistivity in impact craters in crystalline rocks

    Author : Ann Bäckström; KTH; []
    Keywords : 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;

    Abstract : 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. READ MORE

  5. 3. Characterisation of Fractured Rock for Grouting Using Hydrogeological Methods

    Author : Åsa Fransson; Chalmers tekniska högskola; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; hydraulic test; specific capacity; grouting; water pressure test; geological mapping; grout take; aperture; penetration length; transmissivity;

    Abstract : Sealing of tunnels by grouting demands knowledge concerning the fractured rock and the grout, followed by an appropriate choice of strategy and equipment. In this thesis, the characterisation of rock is the main issue and, since it addresses the engineering problem of producing a description for grouting, the properties of grout and the grouting procedure need to be considered. READ MORE

  6. 4. Squat defects and rolling contact fatigue clusters - Numerical investigations of rail and wheel deterioration mechanisms

    Author : Robin Andersson; Chalmers tekniska högskola; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; NATURVETENSKAP; NATURAL SCIENCES; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; rail surface irregularities; rolling contact fatigue clusters; dynamic vehicle–track interaction; rolling contact fatigue; studs; squats; fracture mechanics;

    Abstract : Squat defects, a type of localised rolling contact fatigue damage appearing on rail surfaces with rail break as an ultimate consequence, have concerned infrastructure managers for the last couple of decades. In recent years similar types of defects—so-called studs—that are visually resembling squats, have started to appear. READ MORE

  7. 5. Mapping and characterisation of Swedish bedrock by DC resistivity and transient-field electromagnetic measurement

    Author : Hans Thunehed; Luleå tekniska universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Tillämpad geofysik; Applied Geophysics;

    Abstract : DC electrical and electromagnetic methods have been used for a long time to detect and characterise fracture zones in site investigations and other engineering projects. However, the methods have not been used very much in basic geological mapping of crystalline rock on a regional to semi-regional scale. READ MORE