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1. In an underground excavation, a small inward movement of the sides, roof, and floor of the cavity caused by in situ stress around the excavation. This reduces the permeability of the rock in the immediate vicinity of the excavation.
2. Masonry or steel support in underground workings.
1. In an underground excavation, a small inward movement of the sides, roof, and floor of the cavity caused by in situ stress around the excavation. This reduces the permeability of the rock in the immediate vicinity of the excavation.
2. Masonry or steel support in underground workings.
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