Table 2. Statistics of the Interval of Orthogonal Fracture Structures in Coal.
| observation structural unit | Lm/mm | Ld/mm | Lc/mm |
|---|---|---|---|
| 1 | 4.51 | 3.04 | 9.62 |
| 2 | 4.33 | 3.35 | 7.03 |
| 3 | 4.37 | 3.06 | 8.81 |
| 4 | 5.21 | 3.57 | 9.85 |
| 5 | 3.96 | 3.52 | 9.26 |
| 6 | 4.22 | 2.98 | 8.84 |
| 7 | 4.56 | 4.43 | 9.25 |
| 8 | 4.98 | 2.96 | 7.26 |
| 9 | 4.72 | 3.68 | 9.28 |
| 10 | 5.62 | 3.41 | 10.47 |
| 11 | 5.02 | 3.71 | 8.44 |
| 12 | 5.83 | 4.02 | 7.94 |
| 13 | 4.77 | 3.88 | 8.22 |
| 14 | 4.53 | 3.49 | 9.35 |
| mean value | 4.76 | 3.51 | 8.83 |