Research Article
Study on Ultrasonic Characteristics and Prediction of Rock with Different Pore Sizes
Table 4
Attenuation coefficient before and after drilling of rock samples with different pore sizes at 100 kHz.
| Rock sample number | Aperture size (mm) | Attenuation coefficient before drilling (dB/m) | Attenuation coefficient after drilling (dB/m) | Attenuation coefficient difference (dB/m) |
| A1 | 10 | 21.7 | 22.9 | 1.1 | A2 | 15 | 22.1 | 23.8 | 1.7 | A3 | 20 | 21.7 | 24.2 | 2.5 | A4 | 25 | 21.9 | 24.8 | 2.9 | A5 | 30 | 22.0 | 25.8 | 3.8 |
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