US 12,168,931 B2
Mining method without coal pillars with roof-cutting and roadway retaining
Jiong Wang, Beijing (CN); Wenfei Li, Beijing (CN); Zimin Ma, Beijing (CN); and Guangyuan Yu, Beijing (CN)
Assigned to China University Of Mining and Technology, Beijing, Beijing (CN)
Appl. No. 17/922,128
Filed by China University Of Mining And Technology, Beijing, Beijing (CN)
PCT Filed Apr. 30, 2021, PCT No. PCT/CN2021/091478
§ 371(c)(1), (2) Date May 9, 2023,
PCT Pub. No. WO2021/219131, PCT Pub. Date Nov. 4, 2021.
Claims priority of application No. 202010367096.0 (CN), filed on Apr. 30, 2020.
Prior Publication US 2023/0258083 A1, Aug. 17, 2023
Int. Cl. E21C 41/00 (2006.01); E21C 41/18 (2006.01); E21F 1/00 (2006.01); E21F 16/00 (2006.01)
CPC E21C 41/18 (2013.01) [E21F 1/00 (2013.01); E21F 16/00 (2013.01)] 6 Claims
OG exemplary drawing
 
1. A mining method without coal pillars with roof-cutting and roadway retaining, comprising:
constructing a gas drainage roadway and eliminating outbursts in a working face transport gate area and a working face track gate area on opposite sides of a first mining working face;
constructing the working face track gate, the working face transport gate, a first process roadway and a second process roadway, wherein one end of the working face track gate is communicated with an air inlet main roadway, the other end is communicated with the gas drainage roadway by the first process roadway, wherein one end of the working face transport gate is communicated with the air inlet main roadway, the other end is communicated with the gas drainage roadway by the second process roadway;
constructing a roof-cutting seam blasting ahead of a coal mining face in the working face track gate and the working face transport gate, arranging a blast hole in a stoping side corner line area to form a pre-split cutting seam; and
stoping the working face, forming an roadway retaining section in the working face track gate and the working face transport gate, wherein the roadway retaining section is communicated with the gas drainage roadway by the first process roadway and the second process roadway, forming a complete ventilation system.