| 单词 |
tributary area concept |
| 释义 |
tributary area concept tributary area concept[′trib·yə‚ter·ē ¦er·ē·ə ‚kän‚sept] (mining engineering) A theory that the weight to be supported by a square coal pillar should equal the weight of the rock strata above it plus the weight of rock equal in area to one-half the size of the opening adjacent to all four sides of the pillar. |
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