Sökning: "Rock fractures"

Visar resultat 16 - 20 av 89 avhandlingar innehållade orden Rock fractures.

1. 16. Numerical modelling of geomaterials at failure

   Författare :Alex Spetz; Byggnadsmekanik; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; soil-structure interaction; soil plasticity; phase-field fracture model; compression driven fractures; artificial rock; porous rock; finite element analysis; isogeometric analysis; NURBS; numerical methods;

   Sammanfattning : Geotechnical engineering is the science dealing with mechanics of soils and rocks and its engineering applications. Geotechnical engineering projects vary in a wide range, from evaluation of the stability of natural slopes and man-made soil deposits, to the design of earthworks and foundations. LÄS MER

3. 17. Study of Pumping Pressure and Stop Criteria in Grouting of Rock Fractures

   Författare :Jalaleddin Yaghoobi Rafi; Håkan Stille; Mikael Rinne; KTH; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Rock Mechanics; Grouting; Solid Mechanics; Hållfasthetslära;

   Sammanfattning : Today practice of grouting is based on empirical approaches in that, pumping pressure and stop criteria are determined by benchmarking similar projects. Considering a maximum limit for grouting pressure would allow applying a relatively high pressure that may lead to jacking of the fracture or even uplift of the rock mass. LÄS MER

4. 18. Behaviour of Rock Fractures under Grout Pressure Loadings : Basic Mechanisms and Special Cases

   Författare :Rikard Gothäll; Håkan Stille; Derek Martin; KTH; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Fracture mechanics; grouting; jacking; Building engineering; Byggnadsteknik;

   Sammanfattning : .... LÄS MER

5. 19. Pure shear fracture of brittle rock : a theoretical and laboratory study

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

   Sammanfattning : This doctoral thesis deals with determination of Mode II fracture toughness, KIIc, for rock. Three types of specimens, antisymmetric four-point bending, direct shearing and compression-shear specimens, are experimentally and numerically investigated. LÄS MER

7. 20. Thermo-Mechanical Behaviour of Refrigerated Caverns in Hard Rock

   Författare :Rune Glamheden; Chalmers tekniska högskola; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; thermal deformation; rock caverns; igneous rocks; thermal properties; underground storage; low temperatures; refrigeration; thermal strain;

   Sammanfattning : For almost 4 decades, underground caverns in hard rock have been used to store liquefied petroleum gases (LPG) and refrigerated products, such as foods and chemicals. The design of such facilities has, however, been founded on relatively limited knowledge of the reaction of rock masses to cooling. LÄS MER