Bolt diameter/mm | Second stage | Third stage | Percentage of stress decrease (%) | ||||
---|---|---|---|---|---|---|---|
Kinetic pressure coefficient range | Peak stress/MPa | Vertical closure acceleration rate of displacement/mm/MPa | Kinetic pressure coefficient range | Residual stress/MPa | Vertical closure acceleration rate of displacement/mm/MPa | ||
(a) Vertical stress at Sensor 1 | |||||||
No bolts | 0.50–1.00 | 0.008 | 14.4 | 1.00–1.23 | 0.004 | 25.2 | 50.0 |
18 | 0.50–1.47 | 0.019 | 9.6 | 1.47–1.95 | 0.018 | 15.8 | 18.2 |
30 | 0.50–2.13 | 0.048 | 4.8 | 2.13–2.80 | 0.043 | 10.7 | 10.4 |
Bolt diameter/mm | Second stage | Third stage | Percentage of stress decrease (%) | ||||
---|---|---|---|---|---|---|---|
Kinetic pressure coefficient range | Peak stress/MPa | Rib convergence closure acceleration rate of displacement/mm/MPa | Kinetic pressure coefficient range | Residual stress/MPa | Rib convergence closure acceleration rate of displacement/mm/MPa | ||
(b) Vertical stress at Sensor 2 | |||||||
No bolts | 0.50–1.00 | 0.114 | 12.0 | 1.00–1.23 | 0.052 | 15.2 | 54.4 |
18 | 0.50–1.71 | 0.461 | 6.7 | 1.71–1.95 | 0.353 | 14.6 | 23.4 |
30 | 0.50–2.35 | 0.622 | 3.9 | 2.35–2.80 | 0.587 | 10.6 | 5.6 |
Bolt diameter/mm | Second stage | Third stage | Percentage of stress decrease (%) | ||||
---|---|---|---|---|---|---|---|
Kinetic pressure coefficient range | Peak stress/MPa | Vertical closure acceleration rate of displacement/mm/MPa | Kinetic pressure coefficient range | Residual stress/MPa | Vertical closure acceleration rate of displacement/mm/MPa | ||
(c) Horizontal stress at Sensor 1 | |||||||
No bolts | 0.50–1.00 | 0.060 | 14.4 | 1.00–1.23 | 0.012 | 25.2 | 80.0 |
18 | 0.50–1.71 | 0.111 | 9.6 | 1.71–1.95 | 0.090 | 15.8 | 18.9 |
30 | 0.50–2.13 | 0.148 | 4.8 | 2.13–2.80 | 0.128 | 10.7 | 13.5 |
Bolt diameter/mm | Second stage | Third stage | Percentage of stress decrease (%) | ||||
---|---|---|---|---|---|---|---|
Kinetic pressure coefficient range | Peak stress/MPa | Rib convergence closure acceleration rate of displacement/mm/MPa | Kinetic pressure coefficient range | Residual stress/MPa | Rib convergence closure acceleration rate of displacement/mm/MPa | ||
(d) Horizontal stress at Sensor 2 | |||||||
No bolts | 0.50–1.00 | 0.009 | 12.0 | 1.00–1.23 | 0.006 | 15.2 | 33.3 |
18 | 0.50–1.71 | 0.024 | 6.7 | 1.71–1.95 | 0.022 | 14.6 | 8.3 |
30 | 0.50–2.13 | 0.058 | 3.9 | 2.13–2.80 | 0.056 | 10.6 | 3.4 |