Research Article
Study on the Upper Limit of Roof Failure in Soft Rock Roadway
| Programs | Classification | Diameter (mm) | Length (mm) | Spacing (mm) | Row spacing (mm) | Pretightening force (kN) |
| Program 1 (original program) | Roof bolt | 22.0 | 2400 | 900 | 900 | 60 | Bolt in sidewall | 20.0 | 2200 | 1100 | 900 | 60 | Anchor cable | 18.9 | 7200 | 900 | 900 | 100 |
| Program 2 | Roof bolt | 22.0 | 2400 | 900 | 900 | 80 | Bolt in sidewall | 22.0 | 2400 | 900 | 900 | 80 | Anchor cable | 21.6 | 8300 | 900 | 900 | 120 |
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