Research Article
Research on Surface Subsidence of Long-Span Underground Tunnel
Table 2
Comparison of construction methods of shallow buried excavation.
| Number | Construction method | Conditions of use | Stratum subsidence | Construction period | Construction cost |
| 1 | Full-section method | Good stratum, span ≤ 8 m | General | Shortest | Low | 2 | Step method | Poor stratum, span ≤ 12 m | General | Short | Low | 3 | Double-wall pit guide method | Poor stratum, generally used in stations with a large-span | Comparatively large | Comparatively long | High | 4 | CRD method | Poor stratum, large-span | Comparatively large | Comparatively long | High | 5 | CD method | Poor stratum, span ≤ 14 m | Comparatively large | Comparatively long | General |
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