Research Article
Gob-Side Entry Retaining Technology with Advanced Empty Hole Butterfly-Shaped Weakening in Three-Soft Coal Seam in China
Table 3
Orthogonal test table of stress interference factors.
| Scheme | Factor 1 (MPa) | Factor 2 η | Factor 3 D (cm) | Factor 4 L/D | σ1 (MPa) | σ2 (MPa) | (%) | 1 | 2 |
| 1 | | | | 3.0 | 1.84 | | 3.95 | 4.60 | 4.43 | 2 | 1 | 1 | 1 | 3.5 | 1.83 | 1.77 | 3.39 | 4.58 | 4.43 | 3 | | | | 4.0 | 1.82 | | 2.82 | 4.55 | 4.43 | 4 | | | 1 | | 1.84 | 1.77 | 3.95 | 4.60 | 4.43 | 5 | 1 | 1 | 4 | 3.0 | 1.85 | 1.78 | 3.93 | 4.63 | 4.45 | 6 | | | 6 | | 1.86 | 1.79 | 3.91 | 4.65 | 4.48 | 7 | 1 | 1 | | | 1.85 | 1.78 | 3.93 | 4.63 | 4.45 | 8 | | 3 | 4 | 3.0 | 7.16 | 7.06 | 1.42 | 3.75 | 3.70 | 9 | | 5 | | | 12.5 | 12.3 | 1.63 | 4.01 | 3.95 | 10 | 1 | | | | 7.11 | 7.03 | 1.14 | 3.72 | 3.68 | 11 | 2 | 3 | 2 | 3.0 | 14.2 | 14.1 | 0.71 | 3.72 | 3.69 | 12 | 3 | | | | 21.3 | 21.1 | 0.95 | 3.72 | 3.69 |
|
|