Research Article
Longwall Mining Stability in Take-Off Phase
Table 1
Properties of the materials in each section or span.
| | Section 1 siltstone | Section 2 siltstone | Section 3 siltstone | Section 4 siltstone | Section 5 siltstone | Section 6 siltstone |
| Length of span (m) | 1.25 | 1.25 | 1.25 | 1.25 | 1.25 | 1.25 | Thickness (m) | 1.5 | 1.5 | 1.5 | 1.5 | 1.5 | 1.5 | Young’s modulus (MPa) | 3550 | 3550 | 3550 | 3550 | 3550 | 3550 | Load (kN/m) | 17200 | 17200 | 17200 | 17200 | 17200 | 17200 | Supporting stiffness (MPa/m) | 47.8 | 47.8 | 47.8 | 47.8 | 47.8 | 47.8 | Tensile strength (MPa) | 4.24 | 4.24 | 4.24 | 4.24 | 4.24 | 4.24 | Prop number | 1 | 2 | 3 | Prop stiffness (MPa/m) | 1500 | 1500 | 1500 | Spacing of props (m) | 0.55 | 0.55 | 0.55 |
|
|