Table 1 The geometric parameters of the samples
Sample number | Hollow rock bolt length (mm) | Hollow rock bolt diameter (mm) | Grouted length (mm) | Free length (mm) | Defect length (mm) | Grout ratio (%) |
|---|---|---|---|---|---|---|
1# | 2400 | 25 | ~ | ~ | ~ | ~ |
2# | 2400 | 25 | ~ | ~ | ~ | ~ |
3# | 2400 | 25 | ~ | ~ | ~ | ~ |
4# | 2400 | 25 | 660 | 1740 | 0 | 50 |
5# | 2400 | 25 | 660 | 1740 | 160 | 75 |
6# | 2400 | 25 | 660 | 1740 | 330 | 100 |