Mining Key Technology with 6.2 m High Cutting Height in High Gassy Mine

With the research and development of the high cutting hydraulic powered support, a pass cutting height of a coal mining face over 6 m could the made b y a coal shearer.A cubic gas drainage mode with the surface and underground boreholes, a ventilation mode of a high gassy coal mining face with three fresh air ways and two air returning ways and a large section seam gateway rapid driving and support technique was developed.Thus a completed set of 6.2 m thick seam one pass fu II cutting technology and technique was formed and a safety and high efficient mining was realized under the high gassy and thick seam conditions.The highest day pro duction of the coal mining face reached at 35 000 t, the annual production of the coal mining face was over 7 million t and the advancing rate of the gateway driving rea ched 1 800 m per month.All those provided the references to the high efficient mining in thick seam.