... possible failure plane failure plane tunnel ground transportation srf 1 safety factor railway tunnel finite element method rail transportation stability analysis critical state rock mass deformation Rock Mechanics and Rock Engineering: From the Past to the Future Ulusay et al. (Eds) © 2016...

... being the different shapes of failure of the samples obtained both theoretically and empirically. These shapes are mainly the following ones: In uniaxial compression nearly vertical failure planes; In triaxial compression, failure planes forming angles of 45+ψ/2 with the major principal stress, being ψ...

... bolts and concrete piers for underpinning unstable blocks. XRD analysis showed a significant amount of swelling minerals on the failure plane. Results from Odometers test corresponded to a friction angle between 10 and 15 degrees. The final support included 25 rock anchors each on 200 tons and removal...

... after geological mapping and observation of support performance. Reservoir Characterization reinforcement design mapping failure plane geologic modeling rail transportation rock bolt Stockholm planar failure geological modeling ground transportation high speed rail line bedrock rock...

..., it is confirmed that under constant and uniform normal confining pressure, the shear strength of plug-installed rock models is about twice that of no-plug rock models and that the strength does not depend upon the location of the plug. It is also confirmed that a failure plane can appear in the area on which...

... by the stresses on the failure plane, is stablished depending on dilatancy. The values proposed by Hoek and Brown (1977) are adopted for the angle of dilatancy. These hypotheses are applied to some simplified cases for volcanic materials, and different charts are obtained that associate the slope height and slope...

... of radial confinement and locations of acoustic emission events were measured during the pull-out tests. After the tests, the failure planes generated inside the steel pipe specimen were visualized by means of X-ray CT technology in two-dimensional slices and in three-dimensional images. Based...

... rock mass Reservoir Characterization imbrication particle evaluation Madrid Upstream Oil & Gas non-linear strength law Olalla isla canaria reservoir geomechanics criterion Serrano failure plane volcanic material volcanic agglomerate triaxial test strength law Hoek EVALUATION...

... Characterization Upstream Oil & Gas variation criterion equation failure plane criteria state equation failure envelope compression crack propagation propagation rock type equation principal stress Eurock '96, Barfa (ed.)lC) 1996 Balkema, Rotterdam. ISBN 905410843 6 A proposed criterion...

... metals & mining geomechanical scheme reservoir geomechanics strength Wellbore Design stability condition joint plane coc 6 upper part failure plane plane Vietnam rock layer Reservoir Characterization Upstream Oil & Gas geological structure stability rock mass algebraic...