ORIGIN AND SPACING OF CLEATS IN COAL BEDS.

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作者：

Ting, F.T.C.

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American Society of Mechanical Engineers (Paper) | 1977年 / 77 -Pet-24期

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摘要：

Cleats are natural fractures in coal beds resulting from dehydration, devolatilization, and stresses in the earth's upper crust during coalification. Spacing of cleats ranges from less than one millimeter to over one meter. The frequency of cleating in coal beds affects not only mining but also the flow of gases in the coal, and the strength of pillars used for roof support. The variation in spacing is controlled primarily by two parameters, namely rank and petrographic composition of the coal. The cleat frequency increases with increasing rank and reaches a maximum at the low-volatile bituminous coal rank.

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