Table 1 Physical and mechanical properties of the strata.
From: Stability analysis of existing tunnels under dynamic loads during excavation of new tunnels
Strata | Natural density (g/cm3) | Cohesion (KPa) | Angle of internal friction (°) | Poisson’s ratio | Bulk modulus (MPa) | Elastic modulus (MPa) |
|---|---|---|---|---|---|---|
Cohesive fill soil | 1.97 | 15 | 12 | 0.35 | 3.5 | 9.3 |
Silty clay | 1.95 | 35 | 15 | 0.33 | 4.6 | 12 |
Highly weathered mudstone siltstone | 2.12 | 40 | 27 | 0.28 | 65.2 | 200 |
Moderately weathered mudstone siltstone | 2.72 | 200 | 30 | 0.25 | 986 | 3000 |
