Research Article
Experimental Study on Dynamic Characteristics of Annular Coal Mine Sandstone after Different Temperatures
Table 1
Basic physical parameters of annular samples.
| | Temperature/°C | Specimen number | Before heating | After heating | | Aperture (mm) | Diameter (mm) | Height (mm) | Quality (g) | Aperture (mm) | Diameter (mm) | Height (mm) | Quality (g) |
| | 25 | DJ02-25 | 9.97 | 50.01 | 24.97 | 119.59 | Unheated | | DJ02-26 | 10.02 | 50.09 | 24.88 | 118.98 |
| | 100 | DJ02-29 | 10.03 | 50.04 | 24.99 | 119.88 | 9.98 | 50.08 | 25.02 | 117.97 | | DJ02-30 | 9.91 | 50.09 | 25.02 | 119.42 | 9.90 | 50.11 | 25.05 | 117.69 |
| | 200 | DJ02-35 | 10.05 | 50.03 | 25.03 | 119.95 | 9.98 | 50.01 | 25.12 | 116.53 | | DJ02-36 | 9.94 | 50.09 | 24.99 | 118.75 | 9.85 | 50.11 | 25.05 | 115.30 |
| | 300 | DJ02-38 | 9.94 | 50.09 | 25.01 | 119.78 | 9.81 | 50.13 | 25.11 | 115.73 | | DJ02-39 | 10.02 | 50.12 | 25.00 | 121.49 | 9.91 | 50.12 | 25.10 | 117.53 |
| | 400 | DJ02-41 | 10.02 | 50.14 | 24.96 | 120.67 | 9.86 | 50.21 | 25.08 | 116.23 | | DJ02-42 | 9.95 | 50.08 | 25.03 | 118.08 | 9.79 | 50.18 | 25.13 | 114.07 |
| | 500 | DJ02-46 | 10.04 | 50.08 | 25.00 | 119.99 | 9.80 | 50.20 | 25.10 | 114.72 | | DJ02-47 | 9.93 | 50.07 | 24.98 | 119.39 | 9.74 | 50.17 | 25.13 | 113.98 |
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