Table 2 Bolt pullout test results of the 2603 air inlet roadway in the Zhangcun coal mine.
Test location | Grouping | Anchored section of the surrounding rock | Anchor type | Anchorage section length (cm) | Anchorage force average value (kN) | Failure form |
|---|---|---|---|---|---|---|
2603 Intake Lane | Group 1 | Muddy sandstone | φ22 | 120.8 | 181 | Anchor section failure |
120.8 | 180 | Anchor section failure | ||||
120.8 | 184 | Anchor section failure | ||||
Group 2 | Muddy sandstone | φ22 | 120.8 | 182 | Anchor section failure | |
120.8 | 182 | Anchor section failure | ||||
120.8 | 183 | Anchor section failure | ||||
Group 3 | Muddy sandstone | φ22 | 120.8 | 182 | Anchor section failure | |
120.8 | 184 | Anchor section failure | ||||
120.8 | 182 | Anchor section failure |
