Research Article
A Study on Stress Redistribution of Roadway Sidewall after Hydraulic Fracturing in Coal Bumps Prevention
Table 2
Mechanical properties of each rock strata.
| | Rock strata | Thickness (m) | Bulk modulus (GPa) | Shear modulus (GPa) | Cohesion (MPa) | Internal friction angle (°) | Tensile strength (MPa) | Density (g.cm−3) |
| | Medium sandstone | 15 | 30.0 | 15.0 | 3.2 | 40 | 6.0 | 2410 | | Siltstone | 6 | 6.5 | 5.5 | 4.6 | 52 | 1.8 | 2600 | | Mudstone | 4 | 15.0 | 8.1 | 2.0 | 30 | 2.2 | 2480 | | Medium | 20 | 30.0 | 15.0 | 3.2 | 40 | 6.0 | 2410 |
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