Intermittent mining method

Abstract

The invention discloses an intermittent mining method. The intermittent mining method comprises the steps of step 1. preparation work before mining; step 2. roof supporting; and step 3. coal seam mining, wherein in the step 3 of coal seam mining, a coal seam between a coal face I and a first preliminary open-off cut and a coal seam between a coal face II and a second preliminary open-off cut are reserved as coal pillars used for supporting a roof. The intermittent mining method provided by the invention can be used for greatly improving the recovery rate of coal seam mining, and simultaneously ensuring the safety in production.

Description

technical field [0001] The invention relates to a coal mining method, in particular to an intermittent coal mining method. Background technique [0002] The existing coal mining methods are roughly divided into two types. One is the room-and-pillar coal mining method, that is, the coal in the roadway is not completely mined during mining. Generally, 50% of the coal is mined and 50% of the coal is left. As a coal pillar to support the upper roof of the coal seam, the recovery rate of this method is low, and the highest can only reach 50%; It is necessary to purchase a large number of hydraulic supports. Due to the high price of such hydraulic supports, the cost of coal seam mining is increased, and the fully mechanized coal mining method requires a large investment in equipment when mining coal seams. For small and medium-sized coal mines, the investment is expensive. Advanced mining equipment is extremely uneconomical, and the fully mechanized coal mining method has great l...

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Problems solved by technology

[0002] The existing coal mining methods are roughly divided into two types. One is the room-and-pillar mining method, that is, the coal in the roadway is not completely mined during mining. Generally, 50% of the coal is mined and 50% of the coal is left. As a coal pillar to support the upper roof of the coal seam, the recovery rate of this method is low, and the highest can only reach 50%; It is necessary to purchase a large number of hydraulic supports. Due to the high price of such hydraulic supports, the cost of coal seam mining is increased, and the fully mechanized coal mining method requires a large investment in equipment when mining coal seams. For small and medium-sized coal mines, the investment is expensive. The mining equipment is extremely uneconomical, and the fully mechanized coal mining method has great limitations when dealing with irregular mining faces

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