Table 4 Numerical modeling: macromechanical parameters.
From: Hydraulic horizontal slit-stress synergistic unloading fracturing in coal seams
Rock stratum | Thickness/m | Elastic modulus/GPa | Tensile strength/MPa | Compressive strength/MPa | Poisson’s ratio |
|---|---|---|---|---|---|
Argillaceous siltstone | 40 | 17.7 | 1.46 | 14.65 | 0.28 |
No. 9 seam | 27 | 11 | 2.5 | 30.15 | 0.14 |
Argillaceous siltstone | 9 | 25.7 | 4.5 | 37.86 | 0.18 |
Limestone | 19 | 31.86 | 7.5 | 44.56 | 0.15 |
Fine sandstone | 5 | 23.38 | 4.13 | 40.68 | 0.14 |
