Research Article
Case Study on the Stability Control of Broken Surrounding Rock in Roadway Excavation on the Edge of a Collapsed Stope Area
Table 2
Statistical results of the RQD values before grouting.
| | Drill number | Hole depth (m) | Inclination (°) | Elevation (m) | Coordinate line | RQD value (%) |
| | ZK1 | 26.0 | −6 | −240.0 | Y2 | 43.15 | | ZK2 | 35.0 | −24 | −240.0 | Y2 | 52.72 | | ZK3 | 34.0 | −39 | −240.0 | Y2 | 48.68 | | ZK4 | 43.0 | −53 | −240.0 | Y2 | 54.36 |
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