Table 5 The physical and mechanical parameters of the coal-rock layers.
From: Short-wall roadway backfill method for sustainable mining
No. | Lithology | Layer thickness/m | Density/kg m3 | Poisson ratio | Friction angle/° | Cohesion/MPa | Elastic modulus 104/MPa | Tensile strength/MPa |
|---|---|---|---|---|---|---|---|---|
1 | Loess | 34.73 | 1800 | / | / | / | / | / |
2 | Silty mudstone | 16.10 | 2320 | 0.25 | 32 | 1.70 | 1.0 | 1.2 |
3 | Mudstone | 16.37 | 2320 | 0.25 | 31 | 1.80 | 1.1 | 1.2 |
4 | Sandstone | 28.81 | 2460 | 0.21 | 39 | 3.70 | 2.1 | 2.9 |
5 | Mudstone | 9.41 | 2320 | 0.26 | 30 | 1.60 | 1.1 | 1.8 |
6 | Sandstone | 9.41 | 2450 | 0.21 | 41 | 3.85 | 2.6 | 3.2 |
7 | Muddy siltstone | 12.15 | 2350 | 0.25 | 32 | 1.20 | 1.0 | 1.5 |
8 | Siltstone | 9.18 | 2380 | 0.25 | 40 | 3.75 | 1.2 | 1.7 |
9 | Sandstone | 6.85 | 2450 | 0.21 | 41 | 4.42 | 2.7 | 3.3 |
10 | Siltstone | 2.19 | 2350 | 0.24 | 34 | 3.52 | 1.6 | 1.2 |
11 | Coal seam | 5.00 | 1420 | 0.25 | 35 | 1.0 | 0.885 | 1.084 |
12 | Fine sandstone | 3.20 | 2380 | 0.22 | 42 | 3.2 | 2.1 | 2.5 |
13 | Sandstone | 6.60 | 2350 | 0.24 | 30 | 1.65 | 1.2 | 1.3 |
