Abstract
In order to improve production safety and the gas utilization in highly gassy coal mines, based on thin seam, poor gas permeability and low gas content in thin seams in Laoyingyan mine, the migration paths and abundant region of pressure-relieved gas in gob was studied by means of the strata displacement theory as well as movement regularity of gob gas. Simultaneous production system of coal mining and gas drainage was established in Laoyingyan mine, comprehensive gas drainage methods was adopted such as gas drainage method of highly-located roof crossing hole and the gas drainage method from gob. The results showed that gas drainage volume is 7.2m3/min, gas drainage efficiency was 36.3%, the phenomenon of gas-over-limit was eliminated. It was implemented that the gas resource safe, high efficient and green simultaneous coal mining and gas drainage under the premise of safe production of coal resources.
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