Seam Inclination Affected to Evolution Law of Mining Cracks

A theoretical analysis and numerical simulation were applied to study the space structure features of the mining in different inclined seams.With the calc ulation on the max heights of the falling zone and crack zone during the mining in seam with different inclinations of 0°, 30°, 45° and 60°, the surrounding rock failure an d crack development status of the mining in different inclined seams were obtained.The results showed that with the seam inclination increased, the obvious location of the mine pressure behaviors would be close to the top of the seam inclination direction, the integrated broken scope of the asymmetric "shell structure" would be reduc ed and the broken degree in some area would be more serious.The failure formation was evolved from a failure of a single inclined liner structure to a comprehensive fa ilure of reversed inclined liner structure, the scopes of the failing zone and the crack zone were reduced and the max height was reduced.The max height error of the n umerical simulation and the theoretical analysis corresponding to "the two zones" of the model was 1 .5%~7.6%.