.... fragile rock ground condition overbreak closure Upstream Oil & Gas tunnel face sandstone schist Reservoir Characterization quartzite dia face collapse renewable energy limestone Himalaya tunnel rock mass shale geology gneiss phyllite lesser himalaya thrust CHALLENGES...

... Reservoir Characterization mechanism overbreak atomic energy Fracture Zone Shaft Excavation Upstream Oil & Gas shear failure shaft underground research laboratory orientation proceedings excavation URL microseismic activity fracture failure mechanism underground excavation...

... kilometers. Reservoir Characterization relation reservoir geomechanics orientation Upstream Oil & Gas geological structure overbreak thrust fault rock excavation rock mass matrix dislocation water pressure excavation fracture characterization mylonite stability Rock stress fault...

... predictor equation cannot certainly encounter all complex features associated with the blast. Better predictability can be achieved by accounting explicitly the dominant aspects of pulse initiation and propagation. particle velocity penstock overbreak Reservoir Characterization peak particle...

... SUMMARY: Overbreak is least in strong rocks, and especially in those which contain few discontinuities. Controlling overbreak and ground vibrations demands that blastholes have the optimum orientation and inclination. Overbreak can be largely but not totally controlled by applying...

.... Before this opportunity becomes ability, however, it is first necessary to determine the principal mechanisms, intensity and extent of overbreak, and how each of the several blast parameters affects overbreak. Hamersley Iron Pty. Limited operates two large iron ore open pits at Torn Price...

... at the end of the overbreak and the phenomenon might extend itself. In the contrary, a lot of observations show the stabilization of the shape, which may be explained by a ductile behaviour, related to the decrease of the curve radius. As the scaling off is increased by the use of excavating methods which...