Table 1 The parameters of coal and its roof and floor.
From: Subsidence prediction of overburden strata and ground surface in shallow coal seam mining
Lithology | Thickness (m) | Depth (m) | Bulk density (kg/m3) | Compressive strength (MPa) | Cohesion (MPa) | Poisson's ratio |
|---|---|---|---|---|---|---|
Red soil | 94.70 | 94.70 | 1860 | 0.29 | 0.77 | 0.35 |
Sandymudstone | 14.80 | 109.50 | 2560 | 34.70 | 1.15 | 0.24 |
Siltstone | 21.60 | 131.10 | 2420 | 31.90 | 0.65 | 0.32 |
Medium-grained sandstone | 28.80 | 159.90 | 2160 | 35.30 | 0.80 | 0.29 |
Siltstone | 6.70 | 166.60 | 2420 | 31.90 | 0.65 | 0.32 |
Medium-grained sandstone | 10.00 | 176.60 | 2330 | 40.60 | 1.50 | 0.28 |
No. 1-2 seam | 1.90 | 178.50 | 1290 | 15.70 | 1.10 | 0.28 |
Fine-grained sandstone | 9.40 | 187.90 | 2270 | 29.60 | 1.50 | 0.27 |
Siltstone | 3.80 | 191.70 | 2440 | 36.00 | 0.90 | 0.30 |
Fine-grained sandstone | 5.90 | 197.60 | 2340 | 48.50 | 1.90 | 0.29 |
Siltstone | 1.00 | 198.60 | 2400 | 45.30 | 1.20 | 0.30 |
Fine-grained sandstone | 13.20 | 211.80 | 2300 | 45.60 | 2.20 | 0.27 |
No. 2-2 seam | 4.60 | 216.40 | 1340 | 13.80 | 1.20 | 0.27 |
Siltstone | 3.50 | 219.90 | 2340 | 20.50 | 0.15 | 0.34 |
Fine-grained sandstone | 8.70 | 228.60 | 2280 | 39.10 | 2.20 | 0.27 |
Siltstone | 2.40 | 231.00 | 2400 | 42.50 | 0.70 | 0.31 |
Fine-grained sandstone | 11.70 | 242.70 | 2350 | 47.50 | 2.40 | 0.27 |
Medium-grained sandstone | 6.90 | 249.60 | 2260 | 41.90 | 2.50 | 0.26 |
Siltstone | 3.50 | 253.10 | 2400 | 46.30 | 1.80 | 0.28 |
No. 3-1 seam | 2.70 | 255.80 | 1270 | 10.90 | 1.10 | 0.29 |
Fine-grained sandstone | 2.00 | 257.80 | 2330 | 43.10 | 2.00 | 0.25 |
