考虑衬砌和围岩(土)的相对渗透性，隧洞处于半封闭状态。
Considering the relative permeability of lining and surrounding rock or soil, the tunnel is assumed to be partially sealed.
结果表明，该关系能够为表征金属纤维毡的相对渗透性提供指导。
The results show that the relation can provide guides for the characterization of relative permeability of metal fiber filter.
传统天然气的生产相对简单，但开采非常规天然气则需要通过一些物理及化学暴力手段来使岩石变得更具可渗透性。
Conventional gas production is relatively easy, but getting gas out of unconventional sources requires some physical and chemical violence to make the rocks more permeable.
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