In order to analyze failure law in the deep coal seam floor, using 74 groups of Carboniferous Permian coal seam floor damage depth measured data, the differences between the deep coal seam floor fracture regularity and the shallow coal seam floor fracture regularity were analyzed by the mathematical analyses. The demarcation point of the deep coal seam floor’s fracture regularity and shallow coal seam floor’s fracture regularity was defined. Based on such results, the weight of controlling factors on failure depth in a deep coal seam floor and shallow coal seam floor were analyzed by using the grey correlation analysis. The orders of controlling factors on failure depth deep coal seam floor and shallow coal seam floor were obtained. The mechanism of deep coal seam floor failure law was explored from the coal seam floor mining stress variation. The result showed that the correlation coefficient between the deep coal seam floor’s fracture regularity and shallow coal seam floor’s fracture regularity was smaller with the burial depth from 416 m to 442 m. Otherwise, the correlation coefficient was lager. The mining scale of working face had remarkable influence on shallow coal seam floor failure depth. The possibility of coal seam floor corruption was increased by the larger range of mining stress variation of deep coal seam floor. The buried depth had great influence on deep coal seam floor failure depth.
Journal of Mining & Safety Engineering
coal seam floor
grey correlation analysis
张风达(1988-),男,河南省鹤壁市人,助理研究员,博士,从事承压水体上安全采煤方面的研究。E-mail: email@example.com Tel:010-84262896.