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(1) Presentation(s)


Jeu. 19/04/2018 14:00 Amphi Jean Jacques Moreau, Bâtiment 2, RdC

LINERO Sandra (Faculty of Engineering and Built Environment - The University of Newcastle (UoN))
Investigation of the shear strength of materials that cannot be tested using conventional laboratory equipment due to their large particle size


Coarse mine wastes in open-pit mining are sterile soils and rocks, and material such as low-grade ores with non-significant economical value. This kind of material has to be removed during mining production and transported from the pit to dumps (embankments), to allow the progress of the operation. The particle size distribution (PSD) and maximum particle size of coarse mine waste depend on the geology and blast design. Usually, the blast design is conducted so that the fragmented material has a size suiting the mining equipment (shovels and trucks). In large-scale mining, miners increasingly opt for huge capacity trucks with greater operational efficiency. Trucks of 300-tonne payload and wastes with particles up to 2 m in diameter are not unusual.
Evaluating the mechanical behavior of mine wastes, containing particles of metric-scale, is a challenging task because commercial laboratory testing devices can only accommodate samples composed of particles a few centimeters in size. The construction of larger devices for laboratory testing is not an option due to economic constraints.
The objective of this study is to develop a method to build models for mine waste “prototypes" that can be tested in the laboratory, and from whose behavior the mechanical behavior of the prototype can be predicted. The development of the method needs to consider that particle shape, particle size distribution and particle breakage resistance have an effect on the mechanical behavior of coarse grained materials.

Pour plus d'informations, merci de contacter Gibier F.