Search for dissertations about: "rock failure"

Showing result 1 - 5 of 77 swedish dissertations containing the words rock failure.

2. 1. Deformation and failure of rock

   Author : Kelvis del Carmen Pérez Hidalgo; Håkan Stille; Luleå tekniska universitet; []
   Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Mining and Rock Engineering; Gruv- och berganläggningsteknik;

   Abstract : In this doctoral thesis work the relationship between the deformation and the initiation of failure around an underground excavation was studied. In this work data from observed failure and measured deformations was used. This work is based on information obtained from laboratory test, underground field cases and numerical analysis. READ MORE

4. 2. Hydromechanical breakdown of crystalline rock : a study based on experiments on hot dry rock geothermal energy

   Author : Thomas Wallroth; Chalmers tekniska högskola; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; failure mechanism; microseismicity; reservoir; fluid pressure; pore pressure; jacking shear failure; hot dry rock; seismic event; shut-in; hydraulic fracturing; stimulation; rock stress; joint;

   Abstract : .... READ MORE

5. 3. Time dependent material properties of shotcrete for hard rock tunnelling

   Author : Lars Elof Bryne; Anders Ansell; Wolfgang Kusterle; KTH; []
   Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Shotcrete; rock; granite; bond strength; compressive strength; pullout testing; failure modes; interfacial transition zone; micro structure; ettringite; set accelerator; shrinkage; drains; glass fibres; laboratory testing; tunnels tunnelling;

   Abstract : In this thesis different mechanical properties for shotcrete (sprayed concrete) such as compression strength, bond strength, bending tensile strength, elastic modulus, free and restrained shrinkage as a function of its age was investigated. One of the main issues was to investigate the difference between ordinary cast concrete and shotcrete. READ MORE

6. 4. Rock Mass Response to Coupled Mechanical Thermal Loading : Äspö Pillar Stability Experiment, Sweden

   Author : J. Christer Andersson; Håkan Stille; Charles Fairhurst; KTH; []
   Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Yielding; Spalling; Rock mass strength; Confinement; Fracturing; Tensile failure; Shear failure; Displacement; Acoustic Emission; Heating; Stress; Back calculation; Radial expansion; Mining engineering; Gruvteknik;

   Abstract : The geological disposal of nuclear waste, in underground openings and the long-term performance of these openings demand a detailed understanding of fundamental rock mechanics. A full scale field experiment: Äspö Pillar Stability Experiment was conducted at a depth of 450 m in sparsely fractured granitic rock to examine the rock mass response between two deposition holes. READ MORE

7. 5. Mehanics of Rock Fragmentation Static and Dynamic Laboratory Testing Applied to Aggregate Production

   Author : Bahman Bohloli; Chalmers tekniska högskola; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; anisotropy; aggregates; rock failure; saturation; Brazilian test; dynamic tensile strength; Hopkinson pressure bar; fragmentation; rock fines; crushing;

   Abstract : Knowing the strength properties of rocks is essential for calculating the stability of natural slopes, constructions in and on rock, excavations, blasting geometry, crushing, and drilling. When rock and rock masses are subjected to either dynamic or static loads, the tensile strength is determined by tests appropriate to the load type. READ MORE