Base on the Qitaihe Xinli Mining Area as the background,the gas drainage technology with high level horizontal long borehole in roof was applied to establish the joint mining technology system of gas and coal in the thin seam group with a closed distance in Xinli Mining Area.And base on the principle analysis on the pressure releasing and gas drainage technology,the UDEC4.0 numerical simulaton software was applied to have the roof falling zone height and the crack zone height in the goaf individually as 6~8...
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