Research Article
Experiment on Mine Ground Pressure of Stiff Coal-Pillar Entry Retaining under the Activation Condition of Hard Roof
Figure 7
Additional abutment stress evolution during the hard roof activation above the gob. (a) Measuring point of P1. (b) Measuring point of P2. (c) Measuring point of P3. (d) Measuring point of P4. (e) Measuring point of P5. (f) Measuring point of P6.
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| (b) |
| (c) |
| (d) |
| (e) |
| (f) |