Study and Practices to Improve Coal recovery Rate of Fully Mechanized Top Coal Caving Mining Face in Failure Zone of Small Mine

The paper had an analysis on the features of the failure zone occurred by the previous small mine in Honghui No.1 Mine and the coal lost causes of the fully mechanized top coal caving mining face in the failure zone occurred by the small mine.With the optimization on the geometric parameters of the coal mining face,the reduction of the coal pillar lost in the section,the study on the suitability of the powered supports and matched equipment in the coal mining face,the selection on the rational mining technique,the determination on the rational pre-weakening of the top coal and other measures,the coal recovery rate of the fully mechanized coal mining face in the failure zone by the previous small mine in Honghui No.1 Mine was improved and an effective access was provided to ensure the mine safety and high efficient mining of the coal resources.