Rotary Mining Technology of Fully-Mechanized Coal Mining Face in Deep Inclined Thick Seam with Soft Roof, Soft Coal and Soft Floor

In order to reduces the coal resource lost, a rotary fully-mechanized coal mining technology was applied to the deep inclined (30°) seam with soft roof, s oft coal and soft floor in Panbei Mine. A rotary mining method with a feeding ratio of 1 : 3 and the key technical plan of the rotary mining were designed. Over excavatio n and single square support were conducted in the transportation gateway and the air return gateway in order to adjust the direction of the stage loader and the belt con veyor and to keep the equal length of the coal mining face. Anti sliding jack and chain were connected with the hydraulic support and the scraper conveyor in order to re duce the sliding downward of the scraper conveyor and to keep the integrated stability of units. Chain meshes paved on the roof and H steel were connected at the fron t of supports in order to enhance the roof control and to prevent the spaling and roof falling occurred. The practice results showed that the application of the above tech nology could ensure the safety and high efficient rotary mining of the deep inclined coal mining face in the thick seam with soft roof, soft coal and soft floor. During the r otary mining period, a daily production of mining face could reach 93.1%of the normal fully-mechanized coal mining period and the economic results of the rotary minin g were excellent.