... recommendation from ISRM for the crack initiations. Reservoir Characterization hydraulic fracturing wellbore integrity structural geology Artificial Intelligence Upstream Oil & Gas Chinese Journal Rock mechanics granite axial stress calibration accuracy experiment rock sample accuracy...

... Engineering boundary condition buffer waste management axial stress coefficient repository flexible-swelling test specimen saturation underground repository infiltration equilibrium stiffness coefficient bentonite University load ring deformation oedometer cell void ratio...

... Upstream Oil & Gas axial stress crack closure rock type Reservoir Characterization relation volumetric strain initiation lateral strain structural geology failure criteria deviation mean value Eberhardt crack initiation crack damage strain axial strain deformation parameter...

... load frame. Lateral stresses with different magnitudes are applied on two mutually perpendicular directions(σ 2 ≠σ 3 ),and varyingfrom 0 upto 17 MPa. The axial stress (σ 1 ) is increased until failure. The results are presented in form of octahedral shear strength (τ oct ) vs. mean stress (σ m...

... does underestimate the strength of rock, and suggests how significant improvements may be made by developing and adopting a new testing procedure. 1 INTRODUCTION Knowledge of the axial stress axial strain behaviour of rock as a function of confining pressure is of central importance in rock...