| 摘要 |
A ventilation seal (20) for a mine working (10) includes a upright wall (22) where gaps (28) exist between the mine working and the top (26) and sides of the wall. Elongate grout bags (30,38) are positioned in the gaps (28, 40). The grout bags are inflated with a settable grout under pressure so as to fill and seal the gaps and furthermore so as to place the wall and the roof and sidewalls of the mine working under compressive preload. |
