... ABSTRACT: This paper is in two parts. The first part presents an overview of the strength of intact rock. A short commentary on various methods of fitting failure criteria to experimental data follows, it is demonstrated that the method of fitting the criterion to the test data has a major...

... strength parameters (Fig. 1). The non-dimensional parameter b controls the de- gree of curvature of the envelope, while the scale parameter A has the dimensions [ s ](1-b) (Charles & Soares 1984b). Previous stability analyses with nonlinear failure criterions were limited to 2-D slopes (e.g. Charles...

... ABSTRACT: Application of the Hoek-Brown failure criterion to New Zealand hard greywacke rocks leads to unrealistically high predictions of rock mass strength for better quality rock masses and lower predictions for poorer quality rock masses. To further investigate linkages between rock masses...

...A SIMPLE CRITERION FOR CREEP INDUCED FAILURE OF OVER-CONSOLIDATED CLAYS Gavan J. Hunter1, Nasser Khalili2 ABSTRACT A simple criterion for creep induced failure is proposed for drained loading of over-consolidated clays. The criterion is proposed for the prediction of the long-term shear strength...

..., leading to analytical solutions under simplified geometry, and has been applied to analyze the displacement behavior of a reinforced tunnel face under spherical symmetry (Wong et al., 2000). strength mechanism tunnel face macroscopic strength criterion homogeneous material criterion limit...

... ABSTRACT: This paper discusses the application of the Convergence-Confinement method of tunnel design to rock masses that are assumed to obey the Hoek-Brown failure criterion. The basis of the Convergence-Confinement method and the interpretation of the three basic components of the method...

.... reservoir geomechanics acoustic emission technique delay time core specimen Reservoir Characterization criterion stress determination MPa loading relation variation soft sedimentary rock drift wall Upstream Oil & Gas calculation specimen Kaiser effect determination situ stress stress...

... who applied it to problems that were not considered when the original criterion was developed (Hoek 1983, Hoek and Brown 1988). The application of the method to poor quality rock masses required further changes (Hoek, Wood and Shah, 1992) and, eventually, the development of a new classification called...

... criterion used. An example is given to illustrate the capability of the proposed numerical procedure. INTRODUCTION In their natural state most soils are somewhat anisotropic. Due to the mode of deposition and subsequent loading of soil masses, measurements have shown that the particles tend to adopt...

... ABSTRACT: Many flood protection dikes were damaged in both eastern and western Hokkaido, Japan during large earthquakes in 1993 and 1994 due to liquefaction in the foundations. A criterion based on crest settlement was developed for prioritizing remediation of the diking system to resist...

... excavation tunnel deformation criterion variation lining carnallite tachyhydrite Static and Dynamic Considerations in Rock Engineering, Brummer (ed.) © 1990 Balkema, Rotterdam. ISBN 90 6191 1532 Micro-Computer modelling and practical design/monitoring of large underground excavations C.Douat...

... on the assumptions of (a) the yield criterion; (b) the use of associated or non-associated flow rule; and (c) the dilatancy angle~. Under the axisymmetric plane strain condition, the strains and the displacements are expressed as ur f r _Lu 8r r' - 0 where the subscript r, 8 and z denote respectively radial...

... simulation is made, using a simplified shape (cylindrical tunnel) of the underground opening. The material model is described as follows: Linear elasticity up to a linear Mohr-Coulomb failure criterion. After reaching the Mohr-Coulomb criterion the material fails with a sudden volume increase. The broken...

... to ductile behaviors is observed by the increase of the confining pressure. Upstream Oil & Gas normal stress minimum principal stress minimum stress Reservoir Characterization strength strain energy stress state metals & mining criterion experiment fracture strength triaxial...

... set by.a 25 ~ Cll 20 ~ en en '" 15E-; en l H 10~ 5 o 20 40 60 AXIAL DEFORMATION (mstrain) Figure 6 Creep of a Weald Clay sample left at undrained conditions for a period of 20 hours. failure criteria. This criterion should account both for intrinsic material failure and for the failure mode...

... parameter's single hexagonal pyramidal failure surface suitable extensively to rock-like materials, which thought the effects of both the intermediate principal stress and the hydrostatic pressure at one time, and formed the correspondent criterion for rock-like materials. 1 INTRODUCTION...

... qualitative changes of principal stresses and three-dimensionally stressed states near the mine workings. The developed energy criterion of rock strength includes the deformation forces, acting under the deformation conditions, the shape and volume changing, their limiting values and the Nadai-Laudet...

... ABSTRACT: The strength characteristics of rocks at depth can be, in the first instance, best revealed by conducting triaxial tests in the laboratory. From the available literature, triaxial test data of a large number of rocks has been used to from an empirical non-linear strength criterion...

... rates of d /dt=10- 2 -10-¹ 2 S-¹: brittle yield and dilation at low σm, ideally elastoplastic and non-dilative behavior at high σm' transition from viscoelastic to viscoplastic creep as r rises, of steady-state cracking (with an-nealing), rate dependence of the yield criterion, and primary creep...

... for the purpose of assigning to these rocks, and verifying quantitatively, the new linear strength criterion or brittle failure. Some or the sandstones analyzed preserved the brittle character even at pressures or 300 MPa. However, most or them underwent a transition into transitional and even ductile state...