Failure law and application of complex structure thin coal seam mining face

Fully mechanized equipment development and mining process design about the thin coal seam with nodules and parting should be based on law of mine pressure. By the means of the theoretical analysis, numerical simulation, underground observation methods, authors studied on supporting pressure and the law of coal wall failure about the thin coal seam, and the relationship between support resistance and the coal wall failure, put forward the reasonable cutting depth and supporting strength with the usage of mine pressure effect. Research show that the coal wall inelastic zone width of thin seam mining face is small, the distance between supporting pressure peak position and the coal wall is small, coal wall damage depth is only 0.5-0.6 m; depth of 0.6 m is 1.5 times as big as depth of 0.2 m in resistance indentation strength; the small depth-web is 0.4-0.6 m on the usage of mine pressure to reduce the difficulty of cutting; support resistance has obvious effect on coal wall damage depth, the reasonable working resistance of breaking coal is 2600 kN on the usage of mine pressure. Through the application we have realized the effectively cut of nodules and parting.