Coal Mining Face Inclination Affected to Hard Coal Parting Top Coal Caving Method

Abstract：In order to study the coal mining face inclination affected to top coal caving method,the PFC2D numerical simulation software was applied to simulate the top coal caving law of the different inclined fully mechanized top coal caving mining faces and then in sequence with different top coal caving methods to mine the unconsolidated top coal,to make a statistics on the relationship between the coal mining face inclination and the top coal caving rate with the different caving methods and to have the optimized double sequence top coal caving when the inclination of the fully mechanized coal mining face was 15~30°.The unconsolidated mass medium mechanics principle was applied to analyze that the main factors affected to the coal and coal rejects flow law when the inclination of the coal mining face was different would be the natural repose angle and the coal and rock arch and to discuss the relationship between the coal mining face inclination and the coal rejects boundary line between the top coal and low coal.The coal and rock arch forming possibility would be increased with the inclination of the coal mining face increased.In addition,the paper pointed out that the natural repose angle and the coal and rock arching when the inclination of the coal mining face was different would have the different roles to the coal and rock flow law.