Vice Chairman of the Shanxi Provincial Political Consultative Conference Lvliang Municipal Party Secretary Li Zhengyin

The 3102 fully mechanized caving face of Yong'an Coal Mine is a re-mining face. The top layer of this section belongs to the original mined-out area. When it was pushed down to 338m away from the belt

The three main roads of Duan's mine track, belt and return air are developed along the coal seam floor, and the concentrated return air tunnel is driven along the coal roof. This results in large height differences, large slopes, and coal transportation difficulties in the south and north wings and the centralized return air tunnel. Two belts and two coal sluices need to be installed to drive two inclined rock roads with a length of about 50 meters, which requires a large amount of labor and capital, and the excavation of rock inclined roads is time-consuming and laborious, and there is a large safety hazard, which severely restricts mining. succeed.

A few days ago, the hydraulic fracturing roof technology was successfully tested in the 3112 working face of Duanshi Mine. The technical and safety difficulties existing in the top caving of the fully mechanized mining face are solved.

The Pengfeiqin and Yongan coal mines were built in 1954 and have a mining history of more than 60 years. Because of the long mining age, the remaining recoverable reserves of 3# coal are only 3.7 million tons, and they were once plagued by resource depletion.