Research Article
Study on Failure Characteristics and Rock Burst Mechanism of Roadway Roof under Cyclic Dynamic Load
Table 1
Mesoscopic parameters of the model in PFC2D.
| | Parameter | Diameter (m) | Density (kg/m3) | Porosity | Friction coefficient | Contact modulus (GPa) | Bond modulus (GPa) | Cohesion (MPa) | Tensile strength (MPa) |
| | Main roof | 0.09–0.12 | 2700 | 0.16 | 0.75 | 6.15 | 4.00 | 30 | 20 | | Immediate roof | 0.07–0.09 | 2300 | 0.16 | 0.70 | 5.35 | 3.15 | 25 | 17 | | Coal seam | 0.07–0.09 | 1800 | 0.16 | 0.65 | 2.15 | 2.05 | 10 | 10 | | Immediate floor | 0.07–0.09 | 2100 | 0.16 | 0.70 | 3.00 | 3.00 | 20 | 15 | | Main floor | 0.09–0.12 | 2700 | 0.16 | 0.75 | 6.15 | 3.55 | 30 | 20 |
|
|
