Table 2 Contact parameters.
Mechanics properties | Value |
|---|---|
Connect | |
 Rock-coal weak layer normal stiffness (MPa m) | 500,000 |
 Rock-coal weak layer shear stiffness (MPa m) | 500,000 |
 Between weak layer cohesive(residuals) (MPa) | 3.2 (0.2)–5 (0.2) |
 Between weak layer tension (residuals) (MPa) | 1.1 (0.2) |
 Between weak layer friction (residuals) (°) | 18 (15)–32 (15) |
