Research Article
Structural Mechanical Characteristics and Instability Law of Roof Key Block Breaking in Gob-Side Roadway
Table 1
Parameters of rock mechanics.
| Classification | B (GPa) | S (GPa) | C (MPa) | f (°) | T (MPa) |
| Right key block | 5.65 | 5.25 | 8.0 | 30.5 | 7.6 | Middle key block | 5.65 | 5.25 | 8.0 | 30.5 | 7.6 | Left key block | 5.65 | 5.25 | 8.0 | 30.5 | 7.6 | Immediate roof | 0.65 | 0.62 | 6.0 | 25.6 | 5.4 | Coal body | 0.25 | 0.62 | 6.0 | 30.0 | 2.0 | Immediate floor | 0.53 | 0.41 | 6.0 | 25.6 | 5.3 | Basic floor | 4.80 | 4.60 | 5.0 | 20.0 | 6.0 |
|
|