Research Article
A Study on Stress Redistribution of Roadway Sidewall after Hydraulic Fracturing in Coal Bumps Prevention
Table 3
Mechanical properties of coal in different states.
| | State | Thickness (m) | Bulk modulus (GPa) | Shear modulus (GPa) | Cohesion (MPa) | Internal friction angle (°) | Tensile strength (MPa) | Density (g.cm−3) |
| | Before fracturing | 5 | 2.5 | 1.8 | 3.3 | 22 | 0.8 | 1325 | | After fracturing | 5 | 1.5 | 1.2 | 2.2 | 18 | 0.5 | 1325 |
|
|
