Table 9 Classification standard for large deformation of squeezing tunnel.
Large deformation level | I | II | III | IV |
|---|---|---|---|---|
\(G_{N} = R_{cm} /\sigma_{\max }\) | 0.30 ≥ GN > 0.20 | 0.20 ≥ GN > 0.15 | 0.15 ≥ GN > 0.10 | GN ≤ 0.10 |
Large deformation level | I | II | III | IV |
|---|---|---|---|---|
\(G_{N} = R_{cm} /\sigma_{\max }\) | 0.30 ≥ GN > 0.20 | 0.20 ≥ GN > 0.15 | 0.15 ≥ GN > 0.10 | GN ≤ 0.10 |
