Research Article
Analysis and Application of the Mechanical Properties of the Karst Collapse Column Fillings
Table 1
The lithology and mechanical parameters of the coal roof and floor [
29,
30].
| | Items | Thickness (m) | Density (kg/m3) | Elastic modulus (GPa) | Poisson’s ratio | Cohesive stress (MPa) | Internal friction angle (°) | Tensile strength (MPa) | Porosity | Hydraulic conductivity (m/s) |
| | Medium fine sandstone | 22.4 | 24.0 | 32.74 | 0.23 | 19.46 | 31 | 10.0 | 0.10 | 1.0 × 10−8 | | Sandy mudstone | 9.5 | 24.0 | 28.65 | 0.29 | 16.27 | 32 | 9.50 | 0.18 | 5.0 × 10−8 | | Carbonaceous mudstone | 12.0 | 24.0 | 18.74 | 0.23 | 9.01 | 34 | 1.02 | 0.13 | 1.0 × 10−8 | | Coal rock | 6.7 | 11.0 | 1.96 | 0.35 | 2.52 | 40 | 0.81 | 0.3 | 2.0 × 10−7 | | Mudstone | 12.8 | 24.0 | 18.74 | 0.24 | 10.24 | 33 | 1.02 | 0.14 | 1.0 × 10−8 | | Siltstone | 12.5 | 24.0 | 18.74 | 0.23 | 9.25 | 34 | 1.02 | 0.15 | 2.0 × 10−8 | | Limestone aquifer | 20.5 | 22.0 | 21.53 | 0.28 | 14.56 | 35 | 2.84 | 0.35 | 2.0 × 10−6 | | KCC loose rock | — | 23.5 | 17.58 | 0.24 | 10.52 | 34 | 2.05 | 0.15 | 1.5 × 10−8 | | Natural pores and fissures | — | 0.2 | 0.05 | 0.46 | 0 | 3 | 0 | 0.9 | 5.0 × 10−6 | | KCCFs | — | 20.5 | 0.39 | 0.35 | 1.68 | 28.9 | 0.53 | 0.3 | 3.5 × 10−9 |
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