Research Article
Distribution of Side Abutment Stress in Roadway Subjected to Dynamic Pressure and Its Engineering Application
Table 4
Physical and mechanical properties of the immediate roof with different strength.
| | Category | Bulk modulus/GPa | Shear modulus/GPa | Friction angle (°) | Cohesion/MPa | Tensile strength/MPa |
| | Soft immediate roof | 1.8 | 1.2 | 28 | 1.8 | 1.2 | | Medium hard immediate roof | 3.2 | 2.5 | 32 | 2.6 | 2.8 | | Hard immediate roof | 6.4 | 3.6 | 35 | 3.6 | 3.2 |
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