Abstract
SUMMARY The relation between the geological environment and the stability of longwall structures is discussed. Particular emphasis is given to the influence of cleat orientation on such mine openings. It is shown - on the basis of underground observation in the Doncaster Area - that the major factor affecting face and roadway stability is the relative orientation of the face and roadway direction with the strike direction of the major cleat. Stability problems are likely to occur when the angle between these directions is less than 30°. It is recommended that the direction of all faces in the Barnsley Seam should be at angle between 30° and 60° with the major cleat direction.
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