Download Geotechnical Design for Sublevel Open Stoping by Ernesto Villaescusa PDF
By Ernesto Villaescusa
The 1st accomplished paintings on essentially the most vital underground mining equipment around the globe, Geotechnical layout for Sublevel Open Stoping provides issues in line with the traditional sublevel stoping strategy utilized by so much mining homes, during which a sublevel stoping geometry is selected for a selected mining strategy, apparatus availability, and workforce experience.
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Additional info for Geotechnical Design for Sublevel Open Stoping
An immediate conclusion is that a reduction in stope size may not necessarily result in better stope performance. 10, in which stope performance is clearly related to stope geometry. 2 Rock Mass Strength It is generally accepted that the behavior of the stope walls is largely controlled by the strength of the rock mass surrounding the stope. This rock mass strength depends upon the geometrical nature and strength of the geological discontinuities as well as the physical properties of the intact rock bridges.
Individual joints have a limited size and they may either terminate in intact rock, forming an intact rock bridge, or against another structure within a discontinuity network. These intact rock bridges are significantly stronger than the naturally occurring discontinuities and provide a higher resistance to failure within a rock mass. 13 Example of stope large-scale footwall and hangingwall falloff. , A review of sublevel stoping, in G. , Proceedings of the MassMin 2000, Brisbane, Queensland, Australia, October 29 to November 2, 2000, pp.
Cemented fill can only be justified during extraction of very high-grade orebodies. Recent applications of cemented paste fill are replacing the use of hydraulic fill, thus minimizing the need for brick bulkheads. Another strategy is to leave (planned) permanent pillars between independent (unfilled) hangingwall spans along the entire bench length. 28). In this strategy, it is critical to establish the optimum distances between the pillars in order to minimize the number of pillars required, especially in high-grade orebodies.