Table 2 Development pattern of water-conducting fracture zone and fracture and grouting sequence of isolated layer.
From: Physical simulation study on grouting water plugging of flexible isolation layer in coal seam mining
Mining step | Mining advancement (mm) | Periodic pressure | Isolated layer fracturing | Isolation layer grouting |
|---|---|---|---|---|
0 | Groups 1 to 19 | |||
47 | 228.2 | initial weighting | ||
56 | 360.8 | 1 | ||
61 | 432.7 | 2 | ||
68 | 537.1 | 3 | ||
72 | 592.9 | 4 | ||
81 | 726.5 | 5 | Groups 20 to 21 | |
86 | 798.4 | 6 | Groups 22 to 25 | |
92 | 886.7 | 7 | ||
102 | 1031.6 | 8 | ||
106 | 1090.4 | 9 | ||
112 | 1178.7 | 10 | Groups 26 to 27 | Groups 1 to 13 |
123 | 1338.9 | 11 | ||
132 | 1471.9 | 12 | Groups 28 to 29 | Groups 14 to 15 |
136 | 1528.6 | 13 | ||
143 | 1645.2 | 14 | Groups 29 to 31 | Groups 16 to 17 |
147 | 1686.6 | 15 | ||
153 | 1774.9 | 16 | Groups 18 to 20 |
