Sökning: "Jointed rock mass"

Visar resultat 6 - 10 av 12 avhandlingar innehållade orden Jointed rock mass.

  1. 6. Structural behaviour of shotcrete in hard rock tunnels

    Författare :Andreas Sjölander; Anders Ansell; Richard Malm; Fredrik Johansson; Eivind Grøv; KTH; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; shotcrete; structural behaviour; material models; rock support; bond strength; fibre-reinforcement; Concrete Structures; Betongbyggnad;

    Sammanfattning : Tunnels in hard and jointed rock are normally excavated in an arch shape to enable the rock mass to support its weight. Since the beginning of the 1980's, fibre reinforced shotcrete (FRS) in combination with rock bolts have been the dominating support method for hard rock tunnels. LÄS MER

  3. 7. Water Curtains in Gas Storage. An Experimental Study

    Författare :Carl-Olof Söder; Chalmers tekniska högskola; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; analytical simulations; unlined gas storage; jointed rock; gas migration; gas containment; geo-hydrological test methods; hydromechanical breakdown;

    Sammanfattning : Water curtains have been used for more than 20 years to prevent the escape of gas from caverns excavated in rock. Today, the use of water curtains appears to be increasing, with applications in various forms of storage caverns. LÄS MER

  4. 8. Caving mechanisms for a non-daylighting orebody

    Författare :Sraj Umar Banda; Jonny Sjöberg; Björn Nilsen; Luleå tekniska universitet; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; sublevel caving; numerical analysis; laser scanning; seismic data; large-scale structure; rock mass characterization; failure mechanism; discontinuum modeling; continuum modeling; caving analysis; voronoi modeling; bonded block model; Mining and Rock Engineering; Gruv- och berganläggningsteknik;

    Sammanfattning : The sublevel caving mining method is a mass production method with potentially very low operational costs. The success of this method is dependent on, among other factors, the cavability of the orebody and the overlying rock mass. LÄS MER

  5. 9. Calculation models for estimation of grout take in hard jointed rock

    Författare :Thomas Janson; KTH; []
    Nyckelord :;

    Sammanfattning : The purpose of thls thesis is to descrrbe a method for thedetermination of an expec[ed grouting process, i.e. to have abetter understanding of the most important mechanisms ingroutlng. The aim of groutlng is, to create a watertight zoneagainst water flow. LÄS MER

  7. 10. Numerical modelling of jointed rock masses by distinct element method for two- and three-dimensional problems

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

    Sammanfattning : The mechanical behaviour of a jointed rock mass is strongly, and sometimes dramatically, affected by the behaviour of the discontinuities present in jointed rock mass. In many cases, preferential failures are dominated or defined by the natural discontinuities present in the neighborhood of engineering engineering works. LÄS MER