| 摘要 |
<p>A method of underground mining mineral (10, 11) or preparation of rock cavities, whereby resulting hollow spaces can be refilled entirely or partially with temporarily stabilizing ice (21). The hollow space resulting from the mining is prepared in a first step for ice filling by partially removing the geothermal heat thereof, so that the walls of the hollow space be at a temperature below 0 C. In a second step water is supplied, possibly together with a reinforcing additive, intermittently into the hollow space, said water together with the possibly added reinforcing agent being cooled and frozen (24). In a third step the frozen ice body (21) is maintained by removing the constantly inflowing geothermal energy during a time period deemed necessary for achieving the object. The cooling (24) preferably is effected by artificially cooled air. The first step and the third step, however, can be abolished when the climatic conditions are such that the rock about the hollow space is frozen below the freezing point. The cooling air flows in a closed system (13, 14, 15, 16, 17, l8) which is entirely separated from the ventilation air. </p> |
