Inherent strength and stiffness anisotropy of laminated rocks

The variation of rock strength and stiffness, known as mechanical anisotropy, is expected at different scales: large (rock mass) - or small (intact rock) - scales. It is always mandatory for engineering applications built either on or in anisotropic rock masses to investigate the strength and deformation behavior of those masses. To achieve this goal, continuum-based constitutive models are presented to analyze the mechanical anisotropy. One of both implemented models is named ‘Transubi model’ which considers the transverse isotropic elasticity into bi-linear Mohr-Coulomb strain hardening/softening plastic framework. Experimental investigations and numerical simulations focused mainly on the influence of the mechanical anisotropy on the plastic zoning around excavated openings in laminated rocks. Later, the Transubi model was applied to a tunnel excavated in a shaly facies formation of bedded argillaceous Opalinus clay in an URL (FE-tunnel) to obtain the short-term stability insights. Overall, the research outcomes may have a prospective impact regarding the understanding of anisotropy of laminated, bedded and foliated rocks which improves the deformation behaviour predictability using continuum-based numerical modeling tools.

Level thesis:degree_level

thesis.doctoral

Grantor dc:publisher

Technische Universtät Bergakademie Freiberg

Year

2018

Author dc:creator

• Ismael, Mohamed

Contributors dc:contributor

• Konietzky, Heinz
• Castro Gonzales, Jorge

• Anisotropy
• Constitutive model
• Transverse isotropic
• Tunneling
• Opalinus clay
• Hydro-mechanical
• Anisotropie
• Opalinuston
• Geomechanik