Local optimization suggestions based on heterogeneity identification of the surrounding rock of tunnel face
| Tunnel name | Chainage range | Surrounding rock class | Original design | Local optimization suggestions | ||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Anchor bolts for initial support | Tunnel face reinforcement | Anchor bolts for initial support | Tunnel face reinforcement | |||||||
| Position | Spacing in longitudinal direction /m | Spacing in circumferential direction /m | Position of shotcrete | Position | Spacing in longitudinal direction /m | Spacing in circumferential direction /m | Position of shotcrete | |||
| Xiangjiawan | D2K584 + 320∼D2K584 + 325 | III | Arch wall | 1.5 | 1.5 | Arch wall | 1.2 | 1.2 | Arch | |
| Chufeng | DK528 + 532∼DK532 + 558 | III | Arch wall | 1.5 | 1.5 | Arch wall | 1.2 | 1.2 | Left sidewall | |
| Tunnel name | Chainage range | Surrounding rock class | Original design | Local optimization suggestions | ||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Anchor bolts for initial support | Tunnel face reinforcement | Anchor bolts for initial support | Tunnel face reinforcement | |||||||
| Position | Spacing in longitudinal direction | Spacing in circumferential direction | Position of shotcrete | Position | Spacing in longitudinal direction | Spacing in circumferential direction | Position of shotcrete | |||
| Xiangjiawan | D2K584 + 320∼D2K584 + 325 | III | Arch wall | 1.5 | 1.5 | Arch wall | 1.2 | 1.2 | Arch | |
| Chufeng | DK528 + 532∼DK532 + 558 | III | Arch wall | 1.5 | 1.5 | Arch wall | 1.2 | 1.2 | Left sidewall | |