Sökning: "fracture mapping"

Visar resultat 6 - 10 av 18 avhandlingar innehållade orden fracture mapping.

1. 6. Rock mass behavior under hydropower embankment dams with focus on fracture erosion and rock mass stability

   Författare :Alexander Bondarchuk; Ignacio Escuder-Bueno; Luleå tekniska universitet; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Mining and Rock Engineering; Gruv- och Berganläggningsteknik;

   Sammanfattning : In Sweden there are about 190 large hydropower dams of varying age. According to the definition by the International Commission of Large Dams (ICOLD), if the height of the dam exceeds 15 m it is referred as large. Majority of these dams are of embankment type. LÄS MER

3. 7. Strength and deformability of fractured rocks

   Författare :Majid Noorian-Bidgoli; Lanru Jing; John A. Hudson; KTH; []
   Nyckelord :Fractured crystalline rocks; Numerical experiments; Discrete element methods DEM ; Discrete fracture network DFN ; Representative elementary volume REV ; Coupled hydro-mechanical processes; Anisotropy; Effective stress; Failure criteria; Stochastic realizations; Land and Water Resources Engineering; Mark- och vattenteknik;

   Sammanfattning : This thesis presents a systematic numerical modeling framework to simulate the stress-deformation and coupled stress-deformation-flow processes by performing uniaxial and biaxial compressive tests on fractured rock models with considering the effects of different loading conditions, different loading directions (anisotropy), and coupled hydro-mechanical processes for evaluating strength and deformability behavior of fractured rocks. By using code UDEC of discrete element method (DEM), a series of numerical experiments were conducted on discrete fracture network models (DFN) at an established representative elementary volume (REV), based on realistic geometrical and mechanical data of fracture systems from field mapping at Sellafield, UK. LÄS MER

4. 8. Scale and Stress Effects on Hydro-Mechanical Properties of Fractured Rock Masses

   Författare :Alireza Baghbanan; Lanru Jing; Jian Zhao; KTH; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Aperture-trace length correlation; Discrete Fracture Network DFN ; Representative Elementary Volume REV ; Strength; Stress-Strain curve; Discrete Element Method DEM ; Stress effect; Deformability of fractures; Earth sciences; Geovetenskap;

   Sammanfattning : In this thesis, the effects of size and stress on permeability, deformability and strength of fractured rock masses are investigated. A comparison study was carried out to examine the effects of considering, or not considering, the correlation between distributions of fracture apertures and fracture trace lengths on the hydro-mechanical behavior of fractured rocks. LÄS MER

5. 9. Geoelectrical imaging for interpretation of geological conditions affecting quarry operations

   Författare :Mimmi K. Magnusson; Joanne Fernlund; KTH; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Electrical resistivity imaging; Rock-mass quality; Aggregate production; Geophysical methods; Induced polarization; Normalized induced polarization; Environmental engineering; Miljöteknik;

   Sammanfattning : Determination of the subsurface geology is very important for the rock quarry industry. This is primarily done by drilling and mapping of the surface geology. However in Sweden the bedrock is often completely covered by Quaternary sediments making the prediction of subsurface geology quite difficult. LÄS MER

7. 10. Spinal fractures related to ankylosing spondylitis : Epidemiology, clinical outcome and biomechanics

   Författare :Yohan Robinson; Claes Olerud; Helena Saraste; Uppsala universitet; []
   Nyckelord :MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; ankylosing spondylitis; spinal fractures; Orthopaedics; Ortopedi;

   Sammanfattning : Background: Spinal fractures related to ankylosing spondylitis (AS) are often associated with serious complications. Therefore, knowledge of the incidence, best treatment, outcome, and prevention would assist in improving current guidelines. LÄS MER