Research Article
Study on the Retention of Large Mining Height and Small Coal Pillar under Thick and Hard Roof of Bayangaole Coal
Table 3
Calculation results of principal stress at each measuring point of Bayangaol mine.
| | Point | Depth (m) | Maximum principal stress (σmax) | Intermediate principal stress (σmid) | Minimum principal stress (σmin) | | Numerical (MPa) | Direction (°) | Dip angle (°) | Numerical (MPa) | Direction (°) | Dip angle (°) | Numerical (MPa) | Direction (°) | Dip angle (°) |
| | 1 | 620 | 22.95 | 112.58 | 17.76 | 19.84 | 19.11 | 10.68 | 15.98 | 259.52 | 69.08 | | 2 | 620 | 29.45 | 102.65 | −13.4 | 18.05 | −10.15 | −10.34 | 15.53 | 116.32 | −72.9 | | 3 | 636 | 24.87 | 269.70 | −2.80 | 16.41 | 0.31 | −12.11 | 15.71 | 166.89 | 77.56 |
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