Research Article
A Control Approach of the Roof in No-Pillar Roadway Formed by Roof Cutting and Pressure Releasing
Table 1
Criteria for judging roadway roof state.
| State of rock beam | Fixed two end beam | Critical state | Simply supported beam | Critical state | Failure |
| t | t < tg | t = tg | tg < t < tz | t = tz | t > tz | ω | ω < ωg | ω = ωg | ωg < ω < ωz | ω = ωz | ω > ωz |
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