Table 5 Comparison of the construction time for the initial design and the revised design.
From: Study on stress variation of advance fiberglass anchor bolts during tunnel excavation process
Project details | Initial design | Revised design |
|---|---|---|
Number of bolts per cross-section | 182 | 98 |
Time for construction of one-cycle of bolting | 6 d | 2.5 d |
Time for excavation of one cycle and the associated advance length | 3d/8 m | 2d/6 m |
Average tunneling speed | 0.88 m/d | 1.33 m/d |
