Method of mining single steeply-inclined thick coal seam

Abstract

Provided is a method of mining a single steeply-inclined thick coal seam, which belongs to the mining engineering field. The mining method includes: carrying out one transport crossheading along a floor of the coal seam to constitute a production system together with rises on both sides of a district; arranging a top-coal caving hydraulic support along a thickness of the coal seam in the transport crossheading, with a cyclic advance interval being 1.0 m; maintaining one section of return air channel close to a side of a roof that is in a gob and behind the hydraulic support. In a case of mining, caved coals fall on a scraper conveyer and transported through a belt conveyer. Fresh air flow required for a working surface enters the transport crossheading through a district transport crosscut and a track rise, and then enters the return air rise through the return air channel after washing the working surface. A unique return air channel is adopted. The method features advantages such as simple roadway arrangement system, strong adaptability, large yield of working surface, and high safety level.

1 . A system for mining a single steeply inclined thick coal seam, comprising a roadway arrangement system, a supporting system, a transportation system and a ventilation system, wherein,
 the roadway arrangement system is formed by a transport crossheading and a district rise, the transport crossheading is arranged at a floor of the thick coal seam and the district rise is obtained by connecting both sides of the coal seam;   the supporting system comprises a top-coal caving hydraulic support, a single hydraulic support, a hinged top beam, an anchor bolt and a metal net, the top-coal caving hydraulic support is located in the transport crossheading, a roof in the roadway is supported by disposing an anchor bolt with protection provided by a disposed metal net, and advanced temporary supporting is completed in cooperation with the single hydraulic support and the hinged top beam located in front of a working surface;   the transportation system comprises a scraper conveyer and a belt conveyer, and a head of the scraper conveyer is overlapped with a tail of the belt conveyer; and   the ventilation system comprises a return air channel, the return air channel is close to a coal seam roof side that is behind the top coal caving hydraulic support and in a gob, the return air channel is used to allow dirty air washing the working surface to enter a return air rise in the district rise.   
     
     
         2 . The system for mining a single steeply-inclined thick coal seam according to  claim 1 , wherein the transport crossheading adopts a quadrilateral roadway. 
     
     
         3 . The system for mining a single steeply-inclined thick coal seam according to  claim 1 , wherein a cyclic advance interval of the top coal caving hydraulic support is 1.0 m. 
     
     
         4 . The system for mining a single steeply-inclined thick coal seam according to  claim 1 , wherein there is only one transport crossheading in the roadway arrangement system. 
     
     
         5 . A method of mining a single steeply-inclined thick coal seam, comprising in sequence:
 a. carrying out a transport crossheading along a floor of the coal seam to connect district rises on both sides of the coal seam;   b. arranging a top coal caving hydraulic support in the transport crossheading along a thickness of the coal seam, each cyclic advance interval of the top coal caving hydraulic support being 1.0 m;   c. maintaining one section of return air channel at a side of a gob of the top coal caving hydraulic support, and maintaining a next section of return air channel along with advance of the top coal caving hydraulic support to lead to a district return air rise and so on;   d. advancing the working surface by full seam mining of top coal caving and transporting out the caved coals by a transportation system;   e. fresh air flow arriving at a track rise through a district transport crosscut and then entering the transport crossheading and then to the mining working surface, and dirty air washing the working surface arriving at the district return air rise through the return air channel and then entering a mining shaft return air system;   wherein the mining method is applicable to mining of a single steeply-inclined thick coal seam of more than 5.5 m.   
     
     
         6 . The method of mining a single steeply-inclined thick coal seam according to  claim 5 , wherein, at step d, the caved coals fall on the scraper conveyer and scattered coals are loaded onto the scraper conveyer and then the coals are transported out in cooperation with the belt conveyer.