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Investigation of Structural Heterogeneity of Coal Seams as the Important Geological Condition for Outbursts of Gas and Coals at "Mitsui-Sunagawa No.1" Coal Mine Tadaharu KUROIWA, Shoji NAKAMURA and Akira KIKUCHI Generally speaking, Japanese coal seams are more heterogeneous than those in European coal fields in structural constitution, so it is very important to explore the actual state of their structural heterogeneity in our fields for the sake of studying on heir dangerous condition for the outbursts of gas and coals. The authors investigated four seams, different in ratio of outbursts occurence, about four principal heads (material content, strength, rate of geological trouble, and properties for gas carrier) in separate coal bands under similar mining-geological situation at "Mitsui-Sunagawa No.1" coal mine. Through this work the structural heterogeneity of four seams was analyzed and expressed numerically and quantitatioely. On the other hand, the authors examined the applicability of four foreign calibrating formulas for the critical classification of coal seams on the danger of outbursts to our fields, and found it impossible to adopt them without concrete correction. As a result of this analysis, the authors recognized that it was most important to consider the actual constitution of finly band of cooly argillite "Gan-Bai" more puluerized through tectonic action as a basic factor in case of determining the potential danger for the outbursts of our coal seams.

nihon kōgyōkaishi/nihon kougyoukaishi

Investigation of Structural Heterogeneity of Coal Seams as the Important Geological Condition for Outbursts of Gas and Coals at &amp;ldquo;Mitsui-Sunagawa No.1&amp;rdquo; Coal Mine