Effect of Rock Type and Tunneling Machine on Bulk Material Handling Parameters
Size and strength tests were performed on eleven samples of machine-produced muck derived from nine different tunnels. The object was to determine if the material handling characteristics of the muck could be varied, and thus improved, by varying a machine's cutting parameters. Since most machine-driven tunnels use some combination of conveyor belts and track haulage plus a certain number of gravity transfer points, the desired handling characteristics are freedom from cohesion and a reasonably high angle of internal friction. The sizing tests tend to demonstrate that single-disc cutters produce the coarsest-sized consists. The strength tests show that if a single-size product (uniform grading) is considered, then the finer is the product, the higher is its friction angle. If a product of mixed sizes is considered (well-graded), then the more coarse material that is contained in the consist, the higher is the angle.
L. W. Saperstein and D. E. Raab, "Effect of Rock Type and Tunneling Machine on Bulk Material Handling Parameters," Rapid Excavation and Tunneling Conference Proceedings, Society for Mining, Metallurgy & Exploration Inc. (SME), Jan 1974.
Rapid Excavation and Tunneling Conference
Mining and Nuclear Engineering
Article - Conference proceedings
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