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The retreat working of development roads
The retreat working of development roads
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机译:开发之路的退修
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摘要
According to the invention, the retreat working of development roads or other galleries no longer takes place by withdrawing the support and roof-fall exploitation but rather by the support remaining in the gallery by backfilling, a building material being used which is hydraulically bonding, non-water-soluble and to which a waste disposal product is added as an aggregate.
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