Table 3 Parameter calculation results.
From: Roadway rock burst prediction based on catastrophe theory
Stress of primary rock /\({\text{MPa}}\) | a0 | a1 | a2 | a3 | a4 | u | v | Δ | Catastrophe discrimination |
---|---|---|---|---|---|---|---|---|---|
1.25 | 1.000 | 1.000 | 1.000 | 1.000 | 1.000000 | 0.156 | 0.156 | \(> 0\) | Stabilization |
2.50 | 1.000 | 1.000 | 1.000 | 1.000 | 1.000000 | 0.156 | 0.156 | \(> 0\) | Stabilization |
3.75 | 1.000 | 1.000 | 1.000 | 1.000 | 1.000000 | 0.156 | 0.156 | \(> 0\) | Stabilization |
5.00 | 1.000 | 1.000 | 1.000 | 1.000 | 1.000000 | 0.156 | 0.156 | \(> 0\) | Stabilization |
6.25 | 1.000 | 1.000 | 1.000 | 1.000 | 1.000000 | 0.156 | 0.156 | \(> 0\) | Stabilization |
7.50 | 2.510 | −0.014 | 0.045 | −0.013 | 0.000853 | −9.331 | −18.174 | \(> 0\) | Stabilization |
8.75 | 2.339 | 0.230 | −0.064 | 0.006 | −0.000264 | 16.622 | 119.524 | \(> 0\) | Stabilization |
10.00 | 2.384 | 0.169 | −0.039 | 0.002 | −0.000066 | 70.417 | 757.109 | \(> 0\) | Stabilization |
11.25 | 2.507 | 0.017 | 0.017 | −0.006 | 0.000304 | −22.440 | −87.427 | \(> 0\) | Stabilization |
12.50 | 2.544 | −0.026 | 0.032 | −0.008 | 0.000384 | −18.782 | −74.623 | \(> 0\) | Stabilization |
13.75 | 2.833 | −0.344 | 0.132 | −0.020 | 0.000839 | −11.991 | −42.417 | \(> 0\) | Stabilization |
15.00 | 2.365 | 0.143 | −0.011 | −0.004 | 0.000286 | −29.133 | −38.695 | \(< 0\) | Catastrophic Change |