Constraint - The Missing Variable in the Coal Burst Problem

Babcock, C. O.
Organization: International Conference on Ground Control in Mining
Pages: 9
Publication Date: Jan 1, 1984
In this Bureau of Mines report, the authors present the results of laboratory tests on the burst proneness of coal, Many researchers have studied the violent breaking of large coal masses in underground mines, called bursts, but the causes remain uncertain. They have often assigned to geology and gas pressure the causative roles. The objective of this work is to show that stress can produce bursts in my coal if constraint is necessary for pillar survival and is suddenly lost. We tested coal samples from 15 mines, in 11 coal seams, in six states in the laboratory, and 13 were made to burst. These burst were produced in several ways, but segmented steel platens were used in the tests reported. Two parameters analogous to the momentum and k-tic energy were used to rank the burst proneness of the coals tested. Tangential strains over the the surface of the model coal pillar were measured to reveal a periodic slipping prior to the burst.
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