Research Article
Case Studies of Comprehensive Gas Control Method during Fully Mechanized Caving of Low-Permeability Ultrathick Coal Seams
Table 2
In situ stress measurement points and borehole layout parameters.
| | No. | Drilling depth (m) | Azimuth (°) | Elevation angle (°) | Depth (m) | Lithology |
| | I | 12.8 | 331 | 5 | 346 | Fine sandstone | | II | 12.0 | 325 | 10 | 482 | Fine sandstone | | III | 10.0 | 328 | 5 | 448 | Fine sandstone | | IV | 10.5 | 320 | 41 | 360 | Siltstone | | V | 10.6 | 50 | 41 | 405 | Siltstone |
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