Research Article
Construction Technique of Long-Span Shallow-Buried Tunnel Considering the Optimal Sequence of Pilot-Tunnel Excavation
Table 1
Parameters of surroundings and supporting system.
| | Parameter type | Elastic modulus (MPa) | Poisson’s ratio | Internal friction angle (Celsius degree) | Cohesion (kPa) | Density (kg/m3) |
| | Miscellaneous fill | 3.1 | 0.35 | 12.0 | 8.0 | 1929 | | Clay | 5.0 | 0.33 | 22.5 | 20.5 | 1918 | | Gravel soil | 23 | 0.18 | 30.0 | 5.0 | 2041 | | Gabbro eluvial soil | 7.0 | 0.32 | 26.4 | 15.0 | 1939 | | Large pipe shed | 2000 | 0.2 | — | — | 3000 | | Supporting structure | 28000 | 0.2 | — | — | 2549 |
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