Research Article
Distribution of Side Abutment Stress in Roadway Subjected to Dynamic Pressure and Its Engineering Application
Table 3
Mechanical parameters for the coal of different category.
| Category | Bulk modulus/GPa | Shear modulus/GPa | Friction angle/° | Cohesion/MPa | Tensile strength/MPa |
| Soft coal | 1.4 | 0.8 | 22 | 1.2 | 1.6 | Medium hard coal | 2.3 | 1.2 | 24 | 1.6 | 2 | Hard coal | 4.8 | 2.5 | 32 | 4.6 | 3.2 |
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