根据煤层割理渗透率的各向异性，采用垂直面割理和平行面割理两个方向布置钻孔抽放煤层气。
This experiment bases on different permeability in different directions of coal seam cleats. To arrange methane drainage direction the directions vertical and parallel to face cleat are adopted.
根据煤层割理渗透率的各向异性，采用垂直面割理和平行面割理两个方向布置钻孔抽放煤层气。
This experiment bases on different permeability in different directions of coal seam cleats. To arrange methane drainage direction the directions vertical and parallel to face cleat are adopted.
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