Table 2 Statistical results of coal and rock strain data.
Position of coal and rock relative to the drum | Maximum value/\(\mu \varepsilon\) | Minimum value/\(\mu \varepsilon\) | Average value/\(\mu \varepsilon\) | Standard deviation/\(\mu \varepsilon\) | Root mean square difference/\(\mu \varepsilon\) | Peak value/\(\mu \varepsilon\) |
|---|---|---|---|---|---|---|
L1 | 86.189 | − 13.467 | 44.607 | 9.335 | 45.700 | 99.656 |
L2 | 100.971 | 15.464 | 56.086 | 9.560 | 56.895 | 85.507 |
L3 | − 23.461 | − 109.874 | − 66.489 | 9.649 | 67.192 | 86.458 |
L4 | − 126.962 | − 223.090 | − 173.534 | 11.131 | 173.891 | 96.128 |
L5 | − 179.057 | − 276.643 | − 227.581 | 10.557 | 227.827 | 97.586 |
L6 | 746.367 | 384.381 | 570.233 | 46.637 | 572.137 | 361.984 |
L7 | − 1056.527 | − 1747.543 | − 1364.901 | 100.991 | 1368.632 | 691.016 |
L8 | − 2048.369 | − 3050.494 | − 2550.385 | 78.713 | 2551.600 | 1002.125 |
