Research Article
The Study on Large-Diameter Drilling Prevention Method of Rock Burst in the Xinxing Coal
Table 1
Physical and mechanical parameters of 58-layer coal and rock samples.
| | Sample No. | Specimen size
| Cross-sectional area cm2 | Damage Load kN | Uniaxial compressive strength MPa | Average uniaxial compressive strength MPa | Apparent density kg/m3 | Average apparent density kg/m3 |
| Roof | 1 | | 19.6 | 195.42 | 99.705 | 99.2842 | | | 2 | | 19.6 | 192.46 | 98.192 | | 3 | | 19.6 | 196.18 | 100.093 | | 4 | | 19.6 | 205.43 | 104.813 | | 5 | | 19.6 | 183.49 | 93.618 | | Coal | 1 | | 19.6 | 46.79 | 23.873 | 18.613 | | | 2 | | 19.6 | 38.68 | 19.734 | | 3 | | 19.6 | 36.54 | 18.644 | | 4 | | 19.6 | 29.39 | 14.993 | | 5 | | 19.6 | 31.03 | 15.830 | 1.29 × 103 | Bottom plate | 1 | | 19.6 | 215.27 | 109.832 | 100.2482 | | | 2 | | 19.6 | 187.76 | 95.797 | | 3 | | 19.6 | 200.83 | 102.462 | | 4 | | 19.6 | 193.77 | 98.861 | | 5 | | 19.6 | 184.81 | 94.289 | |
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