Research Article
Physical Modeling of Displacement and Failure Monitoring of Underground Roadway in Horizontal Strata
Table 5
Layout and number of monitoring bolt devices.
| | Layout position | Number | Type | Length of the bolt (mm) | Length of the constant resistance device (mm) | Load value (N) | Constant resistance value (N) |
| | Bolt in roof | R1 | Constant resistance bolt | 400 | 40 | 247.0 | 222.3 | | R2 | Traditional bolt | 400 | 0 | 247.0 | No | | R3 | Constant resistance bolt | 400 | 40 | 247.0 | 222.3 | | R4 | Traditional bolt | 400 | 0 | 247.0 | No |
| | Bolt on both sides | S1 | Constant resistance bolt | 270 | 40 | 79.0 | 71.1 | | S2 | Traditional bolt | 270 | 0 | 79.0 | No | | S3 | Constant resistance bolt | 270 | 40 | 79.0 | 71.1 | | S4 | Traditional bolt | 270 | 0 | 79.0 | No |
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