Research Article
Evaluation of the Adaptability of an EPB TBM to Tunnelling through Highly Variable Composite Strata
Table 4
Physical and mechanical indexes of cored samples from tunnel site.
| | Rock and soil type | Unit weight (kN/m3) | Cohesion (kPa) | Inner friction angle (degree) | UCS (MPa) |
| | Clay | 19.2–19.9 | 20.0–25.0 | 20.0–22.0 | | | Gravel-sand | 20.0–20.4 | | 32.0–35.0 | | | Gravelly clay | 18.3–18.7 | 24.0–25.0 | 22.0–25.0 | | | Fully weathered granite | 18.2–18.6 | 28.0–30.0 | 25.0–28.0 | | | Severely weathered granite | 19.0–21.5 | 38.0–40.0 | 32.0–35.0 | | | Moderately weathered granite | 25.1–25.5 | | | 45.0–60.0 | | Lightly weathered granite | 26.0–26.5 | | | 145.0–170.0 |
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