منابع مشابه
Determination of the Orientation of Open Fractures from Hydrophone Vsp
Open fractures are of interest in many areas such as ground water contamination, hazardous waste disposal, oil and gas recovery, and geothermal energy extraction. In borehole geophysics and engineering, fractures are usually located by acoustic borehole televiewer logging, however, not all of the observed fractures are permeable. The caliper log, on the other hand, provides the information abou...
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This paper gives an overview of the difficulties associated with the design of hard rock pillars in South African mines. Recent examples of large scale pillar collapses in South Africa suggest that these were caused by weak partings which traversed the pillars. Currently two different methods are used to determine the strength of pillars, namely, empirical equations derived from back analyses o...
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We have found that high-quality vertical seismic profile (VSP) data can be collected for near-surface applications using the seismic cone penetrometer. Conemounted accelerometers are used as the VSP receivers, and a sledgehammer against the cone truck baseplate is used as a source. This technique eliminates the need to drill a borehole, thereby reducing the cost of the survey, and results in a ...
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Developing small-molecule inhibitors against protein-protein interaction targets is among the most difficult challenges in contemporary drug discovery. Recent developments in our understanding of this problem, and in the knowledge and tools available to address it, give cause for renewed hope, but substantial challenges remain.
متن کاملNumerical Solution of Hard Rock Disintegration
This paper focuses on a numerical analysis of a hard rock (ore) disintegration process. A bit moves into the ore and subsequently disintegrates it. The disintegration (i.e. fracture of ore) is solved via a deterministic approach (FEM) and a probabilistic approach (FEM in combination with the SBRA Simulation-Based Reliability Assessment method, i.e. Monte Carlo simulations, stochastic inputs). T...
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ژورنال
عنوان ژورنال: GEOPHYSICS
سال: 2012
ISSN: 0016-8033,1942-2156
DOI: 10.1190/geo2011-0490.1