... was found to provide the best fit to the experimental data, for the same values of s½ and ¿¿ m , over the entire range of compressive stresses. The power-law model based on Hertzian contact theory was found to be unsuitable for accurate prediction of fracture normal deformation behavior. 1. INTRODUCTION...

... stress bar information stress change data fracture plane borehole instrument tensile radial fracture stress change cell compressive stress hydraulic fracture stress change fracture Magnitude ARMA/NARMS 04-521 Growth analysis and fracture mechanics based on measured stress change near...

... abutment relaxation cablebolt geometry span compressive stress excavation reduction stress reduction Pacific Rocks 2000, Girard, Liebman, Breeds & Doe (005) © 2000 Balkema, Rotterdam, ISBN 90 5809 1554 The impact of abutment relaxation on stability of underground mine openings Mark S. Diederichs...

... of a true triaxial homogeneous state of compressive stresses (s 1 > s 2 > s 3 ). The samples were loaded in such a way that the maximum principal stress (s 1 ) was oriented at angle ß=90° to the foliation planes (which is the direction of the highest compressive strength), or at angle ß=30...

... deformation oriented perpendicular to the maximum compressive stress. Triaxial compression experiments were performed on Castlegate, an analogue reservoir sandstone, that included acoustic emission detection and location. Initially, acoustic emissions were focused in horizontal bands that initiated...

... and peripheral extensile cracking). A solution to the Barenblatt (1962) expression for the stress field around a crack with a constant opening displacement is used to explain the compression-driven mode I fracturing mechanism, and a numerical simulation demonstrates that the compressive stress shadow decreases...

...% in 1 year and 30% in 100,000 years. Stand-up time may be related to a factor of safety (F.S.) computed as short-term compressive strength of the rock divided by maximum compressive stress in the beam following relief of tension by cracking. F.S. of 2.5 gives stand-up time of decades or centuries...

... (which is perpendicular to the minimum far-field compressive stress) by exploiting poroelastic effects (Bouteca et al., 1983; Bruno and Nakagawa, 1991; Elbel and Mack, 1993; Mack and Elbel, 1994; Wright et al., 1994; Boone and Wawrzynek, 1994). For example, in a paper that appears to be the first...

... application compressive stress Symposium hydraulic fracture horizontal well breakout fracture Drilling society of petroleum engineers Rock Mechanics, Nelson & Laubach (eds) © 1994 Balkema, Rotterdam, ISBN 90 5410 380 8 Rock mechanics issues in petroleum engineering D.Nathan Meehan Union Pacific...

... fracture initiation compressive stress tangential stress induce tension wellbore pressure Cornell University hydraulic fracture perforation fracture interface interface crack propagation Rock Mechanics, Nelson & Laubach (eds) © 1994 Balkema, Rotterdam, ISBN 9054103808 Hydraulic fracture from...

... regional principal stress pore pressure normal stress Pollard fluid pressure tensile parent joint opening-mode fracture compressive stress rock mass contemporaneous orthogonal joint fracture orthogonal joint principal stress daughter joint perpendicular equation deformation Rock...