Search for dissertations about: "Rock stress"

Showing result 1 - 5 of 105 swedish dissertations containing the words Rock stress.

2. 1. Dynamically loaded rock reinforcement

   Author : Anders Ansell; KTH; []
   Keywords : dynamics; vibration; rock reinforcement; stress wave; energy absorbtion; rock bolt; young shortcrete; numerical model; laboratory test; field test; NATURAL SCIENCES; NATURVETENSKAP;

   Abstract : .... READ MORE

4. 2. Lined underground openings : rock mechanical effects of high internal pressure

   Author : Jibao He; Chalmers tekniska högskola; []
   Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; rock mass classification; elasto-plastic solution; high internal pressure; lined caverns; gas storage; in-situ stress; rock mechanics; rock joint;

   Abstract : .... READ MORE

5. 3. Models for analysis of shotcrete on rock exposed to blasting

   Author : Lamis Ahmed; Anders Ansell; Erik Nordström; KTH; []
   Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Shotcrete; Rock; Vibration; Stress waves; Numerical analysis.; Sprutbetong; Berg; Vibrationer; Spänningsvågor; Numerisk analys.;

   Abstract : In underground construction and tunnelling, the strive for a more time-efficient construction process naturally focuses on the possibilities of reducing the times of waiting between stages of construction. The ability to project shotcrete (sprayed concrete) on a rock surface at an early stage after blasting is vital to the safety during construction and function of e. 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. Stress, Flow and Particle Transport in Rock Fractures

   Author : Tomofumi Koyama; Lanru Jing; Marc Boulon; KTH; []
   Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Numerical simulation; laboratory experiments; rock fracture; coupled stress-flow-tracer test; shear displacement; fluid flow; particle transport; finite element method FEM ; particle tracking method; Navier-Stokes equation; Reynolds equation; streamline velocity dispersion.; Geoengineering; Geoteknik;

   Abstract : The fluid flow and tracer transport in a single rock fracture during shear processes has been an important issue in rock mechanics and is investigated in this thesis using Finite Element Method (FEM) and streamline particle tracking method, considering evolutions of aperture and transmissivity with shear displacement histories under different normal stresses, based on laboratory tests. The distributions of fracture aperture and its evolution during shear were calculated from the initial aperture fields, based on the laser-scanned surface roughness features of replicas of rock fracture specimens, and shear dilations measured during the coupled shear-flow-tracer tests in laboratory performed using a newly developed testing apparatus in Nagasaki University, Nagasaki, Japan. READ MORE