... pressure of an assumed fluid column extending to the surface does not exceed the minimum principal stress at a certain location in the salt rock. The results of the investigations are the basis for evaluating the integrity of the salt barrier for an assumed time period of up to 10,000 years. Introduction...

... Abstract True triaxial tests have been carried out on two porous sandstones, Coconino ( n =17.5%) and Bentheim ( n =24%) to investigate the effect of the intermediate principal stress (σ 2 ) on compressive strength, failure-plane angle and failure mode. These rocks were selected because...

... to fluid injection. fluid modeling equation of state joint stiffness minimum principal stress hydraulic fracturing element method natural fracture reservoir geomechanics Upstream Oil & Gas Simulation rock block fracture friction angle American Rock mechanics Association DDA...

... Characterization orientation fracture initiation rock medium in-situ stress reservoir geomechanics horizontal fracture stress state stress concentration horizontal principal stress hydraulic fracturing borehole hard roof stress distribution fracture Upstream Oil & Gas transverse borehole...

... reservoir geomechanics criteria Chang brittle fracture Upstream Oil & Gas plane intermediate principal stress compression Reservoir Characterization criterion MPa Strength Criterion triaxial strength criterion true triaxial testing fracture strength specimen Mogi Haimson...

... ) diagram, indicating that under the same σ m , σ 2 can notably decrease the τ oct at failure. The failure envelope is lower for the greater σ 2 /σ 3 ratio. The results also indicate that the sandstones are transversely isotropic. The effect of intermediate principal stress (σ 2...

... rock mass principal stress equation 29 1 INTRODUCTION Recently with the planning of underground research repository of high-level radioactive wastes, stress determination for a large volume of rock mass with width of several kilometers and depth of more than one kilometer is necessary (Matsuki et...

... straight line collinear crack compression infinite plate principal stress fracture criterion ISRM-Sponsored International Symposium on Rock Mechanics: Rock Characterisation, Modelling and Engineering Design Methods 1 A Fracture Criterion for Specimens Containing Collinear Cracks in Compression...

... Intelligence Simulation Reservoir Characterization renewable energy Rock mechanics major principal stress boundary condition reservoir geomechanics ii hydropower station region dynamical geological process Mining Science outer dynamical geological process stress field hydropower station region...

... are dominated by horizontal stresses, the tectonic stresses take absolute predominance, with the maximum horizontal principal stress up to 42.19 MPa, and the minimum horizontal principal stress up to 22.8 MPa. However, the in-situ stress fields are dominated by gravity stresses in Huainan and Pingdingshan coal...

... overburden geostatic stress gneiss brittle failure foliation plane fracture deviatoric stress rock mass rockburst tunnel Kaiser initial stress principal stress ISRM-Sponsored International Symposium on Rock Mechanics: Rock Characterisation, Modelling and Engineering Design Methods 1...

... excavation principal stress disturbance zone vault adjustment principal stress distribution mechanics ISRM-Sponsored International Symposium on Rock Mechanics: Rock Characterisation, Modelling and Engineering Design Methods...

..., neither in plane strain nor in axisymmetric triaxial loading conditions can the intermediate principal stress be taken into consideration. Many results from the tests conducted on coal, sandstone, marble, granite and ABSTRACT The study of rock fracture under triaxial conditions captures the essential...

... surface-based investigation geophysical survey principal stress geomechanical conceptual model Reconnaissance Survey ISRM-Sponsored International Symposium on Rock Mechanics: Rock Characterisation, Modelling and Engineering Design Methods ABSTRACT JAEA is developing two off-site underground...