... 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...

... 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 for assessment of stability of slopes and for the estimation of the time to the onset of failure...

... strength mechanism tunnel face macroscopic strength criterion homogeneous material criterion limit load reinforcement contribution geometry design theory bolt reinforcement homogenization approach failure mechanism stability analysis optimization cohesive-frictional soil...

... 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...

... the difference strain values were measured 0 10000 20000 30000 40000 50000 0 0.2 0.4 0.6 0.8 1 0 1 2 3 4 5 6 7 Cumulative Counts Criterion C um u la tiv e C o u n ts C rite rio n Stress (MPa) PN4-174 Figure 1: An Example of stress determination by the AE method during loadings between two cycles as a function...

... 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...

... between these blocks. This method was modified over the years in order to meet the needs of users 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...

... 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 ABSTRACT: An approach to the study of four practical problems of rock engineering using a micro-computer program is presented. The intent is to illustrate how a computer model, in these cases involving simple...

... 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...

... Reservoir Characterization Upstream Oil & Gas material property Wellbore Design criterion metals & mining displacement coal wellbore integrity strong convergence radial stress boundary Houillere convergence mathematical simulation tunnel gallery application underground...

... 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...

.... Reservoir Characterization drilling operation pore pressure wellbore integrity strength History specimen Wellbore Design triaxial loading shale Upstream Oil & Gas criterion critical state borehole instability stress level weald clay peak strength mechanical behaviour triaxial test...

... the intermediate principal stress and the hydrostatic pressure at one time, and formed the Correspondent criterion for rock-like materials. 1 INTRODUCTION In the underground winning and the open pit mining, such the problems as the steadiness and the fracturing failure of rock-masses under the general triaxial...

... Reservoir Characterization Upstream Oil & Gas great depth hard rock deformation reservoir geomechanics energy criterion compressive stress mechanical test structural geology principal stress rock strength loading compression metals & mining criterion characteristic state...

... 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...

...-dilative behavior at high a , transition from viscoelastic to vis~o- plastic creep as r rises, of steady-state cracking (with an-nealing), rate depen- dence of the yield criterion, and primary creep with recovery. YIELD BEIlAVIOR Elastoplastic (EP) yield is the conven- tional yield criterion (Y) of rock...

... into con- sideration at present), and to examine certain laws governing. separately, the brittle railure and the brittle-ductile transition in sandstones. 2 LINEAR STRENGTH CRITERION FOR SANDSTONES An induced stress theory or brittle railure or rocks has been developed CKwa~niewski. 19S6b. 19S7b...