Research Article
Analysis of Extent of Deformation Range and Failure Characteristics of Rocks Surrounding a Tunnel Crossing Fault Zone Based on FDEM
Table 3
Input parameters of tunnel excavation introduced in the FDEM numerical model.
| | Parameter | Mildly weathered quartz diorite | Strongly weathered quartz sandstone | Fully weathered soil |
| | Triangular element parameter | | | | | Density, ρ (kg/m3) | 2490 | 2490 | 2260 | | Elastic modulus, E (GPa) | 50 | 25 | 20 | | Poisson’s ratio, | 0.25 | 0.25 | 0.25 | | Mesh size around the tunnel, h(m) | 0.15 | 0.15 | 0.15 | | Viscous damping, μ (kg/m·s) | | | Calculation step, Δt (s) | 1e-7 | | Quadrilateral joint element parameter | | | | | Tensile strength, ft (kPa) | 2180 | 4.2 | 1.3 | | Cohesion, c (kPa) | 7000 | 14.5 | 3.7 | | Type I fracture energy, GI (J/m2) | 10,000 | 1,000 | 400 | | Type II fracture energy, GII (J/m2) | 20,000 | 4,000 | 1,000 | | Internal friction angle, φi (°) | 28 | 35.4 | 35.8 | | Sliding friction angle, φr (°) | 28 | 35.4 | 35.8 | | Normal contact stiffness, Pn (GPa) | 100 | 50 | 40 | | Tangential contact stiffness, Pt (GPa) | 100 | 50 | 40 | | Joint penalty, Pf (GPa) | 100 | 50 | 40 |
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