Research Article
Stability of a Roadway below a Coal Seam under Dynamic Pressure: A Case Study of the 11123 Floor Gas Drainage Roadway of a Mine in Huainan, China
Table 2
Technical parameters of the integrated monitoring system.
| Distributed optical fiber monitoring system | Self-potential monitoring system |
| Diameter of fiber optic cable (mm) | 5 | Number of electrodes | 32 | Strain coefficient (MHz/%) | 499.8 | Electrode space (m) | 1.5 | Maximum break force (N) | 2350 | Effective length (m) | 46.2 | Strain fiber optic cable type | High-strength metal-based fiber optic cable | Control vertical height (m) | 18.79 | Effective length (m) | 46.2 | — | — | Control vertical height (m) | 18.79 | — | — |
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Electrode #32, which should be placed outside the monitoring orifice, was also fixed inside the orifice.
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