Mining Technology of 300 m Long Fully-Mechanized Top Coal Caving Mining Face with Annual Production of over 10 Millions Tons

In order to realize a target of a mine with an annual production of over 10 million tons, taking a ultra thick seam in Pingshuo No.1 Underground Mine un der the conditions of a shallow mining depth, hard coal and hard roof rock as a case, the paper introduced the safety and high efficient mining technology on a 300 m lo ng fully-mechanized top coal caving mining face mainly with the domestic completed set equipment. In combination with the mine strata pressure behaviors of the coal mining face, powered support suitability, top coal caving and other indexes, the paper evaluated the safety and high efficient mining effect of the 300 m long fully-mecha nized top coal caving mining face with an annual coal production of over 10 million tons in the ultra thick seam. The results showed that with a 300 m long coal mining f ace and the fully-mechanized top coal caving mining method, the cutting height of the coal mining face was set as 3. 8 m and the coal caving height was set as 8.7 m. With the rational matched coal mining face equipment, an average production per day of the coal mining face was about 40 000 tons, the average month production of t he coal mining face was 1. 08 million tons, the max month production was 1.18 million tons, the average annual production was over 12 million tons and the coal minin g recovery rate of the coal mining face was 88.98%. The annual production over 10 million tons from a single coal mining face was realized.