Research Article
Instability Mechanism of Cavity-Bearing Formation under Tunnel Excavation Disturbance
Table 1
Physical and mechanical indexes of the model material.
| | Material name | Natural density ρ (g/cm3) | Porosity ratio e | Liquidity factor IL | Cohesive force c (kPa) | Rate of water content ω (%) | Coefficient of compressibility α (MPa-1) |
| | Prototype material | 1.97 | 0.69 | 0.44 | 25.06 | 23.43 | 0.26 | | Model material | 1.91∼1.94 | 0.74∼0.83 | 0.34∼0.71 | 13∼27 | 24.6∼30.4 | 0.162∼0.243 |
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