| 摘要 |
Disclosed is a method for minimizing the entry of water into a mined cavity or underground formation which has thereabove a semi-permeable layer of a shaly material or rock directly below a source layer of water-saturated sand. By means of a borehole, a fluid such as air or oil is injected into a semi-permeable layer to displace water from it. The injected fluid acts as a barrier to reduce the downward leakage of water into the cavity.
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