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 |
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