Research Article
The Study on Large-Diameter Drilling Prevention Method of Rock Burst in the Xinxing Coal
Table 2
Physical and mechanical parameters of 65-layer coal and rock samples.
| Coal and rock sample | Sample No. | Specimen size
| Cross-sectional area cm2 | Damage Load kN | Uniaxial compressive strength MPa | Average uniaxial compressive strength MPa | Apparent density kg/m3 |
| Roof | 1 | | 19.6 | 207.20 | 105.712 | 101.0744 | | 2 | | 19.6 | 190.43 | 97.156 | | 3 | | 19.6 | 196.26 | 100.132 | | 4 | | 19.6 | 214.47 | 109.425 | | 5 | | 19.6 | 182.18 | 92.947 | | Coal | 1 | | 19.6 | 42.45 | 21.659 | 18.003 | | 2 | | 19.6 | 33.94 | 17.318 | | 3 | | 19.6 | 32.32 | 16.488 | | 4 | | 19.6 | 30.14 | 15.375 | | 5 | | 19.6 | 37.59 | 19.177 | | Bottom plate | 1 | | 19.6 | 213.66 | 109.011 | 102.0526 | | 2 | | 19.6 | 207.11 | 105.668 | | 3 | | 19.6 | 200.60 | 102.349 | | 4 | | 19.6 | 193.62 | 98.784 | | 5 | | 19.6 | 185.12 | 94.451 | |
|
|