... stress regionally and with depth in widely different geological environments. INTRODUCTION The in-situ state of stress existing in a rock mass is widely recognised as being of major importance in the performance of excavations in rock. The inherent variability of stress fields associated with complex...

... underground work brittle rock pillar strength consideration diederich 1999 Reservoir Characterization Upstream Oil & Gas support component grouted rebar brittle parameter stress condition guideline reinforcement length bilinear failure envelope cutoff stress field mesh-reinforced shotcrete...

... the experience of the writer, concerning well documented cases of landslides, numerical analyses of slope behaviour and any other element useful to clarify such a relationship. slope movement slope failure Soil property ground surface shear zone rupture stress field pre-failure stage Upstream Oil...

... Response analysis slip surface History safety newmark model procedure stress field EVALUATION OF SEISMIC PERMANENT DISPLACEMENTS BASED ON VARIABLE CRITICAL SLIP SURFACES Takuo Yamagami I, Jing-Cai Jiangl , TieQun Feng2 and Katsutoshi Denol ABSTRACT The conventional Newmark model is widely used...

.... The spatial-temporal self-organizing properties are established in the structure of stress fields around the mining entries of certain orientation in relation to the mining works and tectonic faults. The established behavior peculiarities of the rock massif can be used for prediction of rock dynamic...

... stress field structural domain Magnitude namaqualand metamorphic complex South Africa deposit carolusberg vertical stress province principal stress Broken Hill Reservoir Characterization Situ stress Determination stress determination Upstream Oil & Gas sigma 1 reservoir...

... hydraulic fracturing Reservoir Characterization reservoir geomechanics orientation plane drilling operation sr instrument Upstream Oil & Gas relaxation Directional Drilling fracture direction strain relaxation instrument principal stress procedure stress field hydrostatic...

... reservoir geomechanics compressibility prediction Reservoir Characterization Fluid Dynamics Loading Rate Upstream Oil & Gas Geertsma subsidence stress field literature mechanical effect cavity fracture hydraulic fracturing Reservoir Compaction compaction general report...

... with symmetric elongations aligned With the minimum horizontal stress (Figure 1) (Gough and Bell, 1982; Plumb and Hickman 1985; Zoback et aI., 1985). The systematic alignment of breakouts with the stress field has been exploited as a ~&ure I. Wellbore profile showing the ultrasonic scanner and fi ~ onentation...

... were carried out for the following stress ratios: (J"x/(J"z1 .5 ; (J"y/(J"z O. 5 (Jx/(J"z= 1.0 ; (J"y/(J"z= 0.5 (J"x/(J"z= 1.0 ; (J"y/(J"z= 1.0 The stress fields in the first two cases are fully three-dimensional, and it was therefore necessary to carry out a true three-dimensional stress analysis...

... occur at or near the fault terminus or at the locking area. Because of the inhomogeneity of rocks, the displacement and stress field are always in adjusting, it result that around the rocking area or the fault turminus stress will concentrate to a high degree, and a great deal of elastic energy...

... Upstream Oil & Gas borehole primary crack Injection Rate fracture hydraulic fracturing alo direction borehole wall axial fracture configuration wellbore wall orientation experiment Crack pattern dip angle tensile strength fracture initiation stress measurement stress field...

... stress field tunnel Rock Mechanics and Power Plants, Romana (ed.) e 1988Balkema, Rotterdam. ISBN9061918278 Stability analysis of surrounding rock of underground plant in high in-situ stress region in China and some relevant questions Liu-Shi Huang Northwest China Hydroelectric Investigation...

... and the consequence of stress field superimposition are highlighted. The ramifications ~or interpreting measured stress fields and establishing the appropriate boundary conditions for design are included. Resumé: L''etat des contraintes dans un massif rocheux dépend du regime tectonique, à la fois présent et passé...

... ABSTRACT: Stress measurements in jointed rock are frequently scattered, reflecting non-homogeneity of the stress field and other factors. Integrating a scattered set of stress measurements to obtain a solution for the in situ stress tensor is difficult. In this paper, two alternative...

... USSR stress field Australia irrespectively deformation ABSTRACT: Virgin stress of rock masses of folded areas is a result of tectonomagmatic history of a region. The upper parts of the Earth''s crust in folded areas acted upon by horizontal tectonic forces have undergone through...

... Abstract.: A method for determining the complete regional stress field is presented. It is based on measurements of the normal stress supported by preexisting fracture planes (with various dip and strike) by means of hydraulic tests. The solution does not involve the stress field...

... microstructures; regional stress field in the Gulf Coast; physical expressions of salt domes; and salt modeling results. Résumé: Cette étude, basée sur documentation, des conditions de pression in situ dans les domes de sel dans Ie Sud-Est des Etats-Unis, suggère que les pressions vierges in situ à l...

... Reservoir Characterization tectonic stress field horizontal stress shear stress Engineering upper crust application reservoir geomechanics variation stress state stress measurement Upstream Oil & Gas situ stress measurement stability China maximum horizontal stress field...

... depth) at a number of locations throughout Australia. Where the results obtained were considered to be reliable, they generally indicated a NE-SW or E-W orientation of the maximum horizontal principal stress. These results, while they have served to delineate some broad features of the stress field...