Description | Properties | Values |
Excavation | Top heading & benching |
|
Provisional invert | Shotcrete thickness [mm] | 150 |
Shotcrete (initial lining) | C25/30 thickness [mm] | 250 |
Rock bolt (initial lining) | Self-Drilling anchors | R32N |
Bolt axial stiffness [kN/m] | 1.15 * 105 | |
Equivalent soil cluster for pipe umbrella | Thickness [mm] | 35 |
Elasticity modulus E [MPa] | 16,600 | |
Cohesion c [kPa] | 5000 | |
Unit weight ɣ [kN/m3] | 24 | |
| Poisson’s ratio ν [-] | 0.25 |
Final lining | Inner concrete lining c25/30 thickness [mm] | 300 |
Surrounding soil property | c' [kPa] | 500 |
Internal angle of friction ø’ [˚] | 25 | |
E [MPa] | 250 | |
Poisson’s ratio ν [−] | 0.25 | |
Unit weight ɣ [kN/m3] | 24 |