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Abstract
A feature of outbursts in the Western part of the South Wales coalfield is the presence of a coal with unusual structural features in areas subject to outbursts. The effect of such a coal on the outburst process is discussed and a hypothesis presented to explain the mechanism of an outburst. This suggests that an outburst is a two-phase phenomenon, triggered by the dynamic failure of the outburst coal during the change from confined to unconfined stress conditions in the face of an advancing working excavation, and extended by the subsequent desorption of gas contained in the coal structure.
Published Version
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