Research Article
Mechanical Mechanism and Propagation Law of Fissure-Tip Cracks of Large-Size Rock Specimens with Two Precut Fissures
Table 3
The numbers, lengths, and positions of the major cracks.
| Specimen | Inner tip crack | Total length (mm) | Numbers | Angles between the wing cracks and the fissure plane (°) | Angles between the secondary coplanar cracks and the fissure plane (°) | Angles between the secondary inclined cracks and the fissure plane (°) |
| A-1 | Upper crack | 145 | 2 | −112 | −10 | — | Lower crack | 284 | 3 | −106, −45 | — | 83 | A-2 | Upper crack | 108 | 2 | −70 | — | 92 | Lower crack | 140 | 3 | −105 | 11 | 85 | B-1 | Upper crack | 152 | 2 | −135 | — | 150 | Lower crack | 124 | 2 | −62, −81 | — | — | B-2 | Upper crack | 82 | 2 | −94, −78 | — | — | Lower crack | 126 | 2 | −108, 65 | — | — | C-1 | Upper crack | 138 | 3 | −30,−85 | — | 25 | Lower crack | 145 | 3 | −66 | −10 | −62 | C-2 | Upper crack | 87 | 2 | −20, −72 | — | — | Lower crack | 120 | 2 | −55 | — | 94 |
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