Design and Strata Behaviors Laws of "L" Type Working Face in Thick Coal Seams

In this paper, the coal seam occurrence conditions and restriction factors of production in Lutian Coal Mine was studied, the results showed that NO.2602 mining gateway with "L" type layout mode broke through the conventional concept of the traditional design of upper and lower roadway, which improved the actual coal recovery rate of the working face, reduced driving amount of mining roadway and roadway formation cost, simplified the production system. At the same time, from the aspects of strata behaviors, it eliminated the effects of the fixed support pressure on the upper working face; the roof pressure the bracket bore was smaller, the maintenance of the upper working face was easier, the bracket had better adaptability for the roof.