... 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...

... effect on the estimates obtained of the material properties. The results of a recent analysis of a large data base of test results is then presented. This demonstrates that there are inadequacies in the Hoek-Brown empirical failure criterion as currently proposed for intact rock and, by inference...

... r s o o f M o h r s c i r c l e c a n b e e x p r e s s e d b y e q u a t i o n ( 4 ) . d 2 = ( s o - s ) 2 + ( 1 - s / s t ) 2 / a · t R 2 . ( 4 ) Figure 4 : Proposed failure criterion and dmin T o d e t e r m i n e d m i n t h e f o l l o w i n g e q u a t i o n i s f i r s t o b t a i n e d a c...

... profiles the stability analyses were carried out. As for the input data of stability analyses the results of triaxial, rotation and direct shear tests along with the modified Hoek&Brown failure criterion were used. The critical failure was also accurately determined by means of inclination measurements...

... 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...

.... This paper presents an example which introduces the calculation method for the relaxed zone in rocks, with the above numerical analysis using data from field measurements. Taking into account the in-situ condition of rocks in the BEM analysis, an empirical failure criterion for rock was used. After...

... with the program MAUS taking into account the nonlinear, time and temperature dependent behaviour of the rock salt. A failure criterion was also considered. The results of the numerical analyses show that the thermal load induces a clearly higher closure rate of the drift but only a minor additional load...

... directly from strains evaluated by the measured displacements, without analyzing stress distributions around a cavern. The practical examples are shown to demonstrate an applicability of this technique. The failure criterion of rock and soil masses is also discussed in connection with the proposed...

.... extensometer failure criterion bedrock shelter Reservoir Characterization criterion Hervanta rock mass reservoir geomechanics Thickness civilian use Rock Stress Measurement hockey calculation air-raid shelter London construction shelter bedrock shelter ofhervanta roof area fracture...