Table 1 Ultrasonic test results.
From: Research on dust and rockburst control technology for coal mining and mathematical correlation
Coal sample number | Vp(m·s-1) | Vs(m·s-1) | Vp/Vs |
|---|---|---|---|
1# | 1232 | 725 | 1.699 |
2# | 1218 | 731 | 1.666 |
3# | 1221 | 733 | 1.665 |
4# | 1240 | 719 | 1.723 |
5# | 1248 | 729 | 1.712 |
6# | 1251 | 723 | 1.730 |
