Research Article
Experimental Investigation on Seepage Stability of Filling Material of Karst Collapse Pillar in Mining Engineering
Table 2
The seepage property parameters.
| Specimen | Initial porosity | Initial permeability k0 (10−14 m2) | Stable permeability ks (10−14 m2) | Seepage instability duration T(s) |
| With clay | 0.11 | 2.83 | — | 278 | 0.13 | 4.64 | — | 180 | 0.15 | 7.80 | — | 77 | 0.17 | 14.38 | — | 34 |
| With gypsum | 0.11 | 1.85 | 0.49 | — | 0.13 | 3.10 | 1.09 | — | 0.15 | 3.69 | — | 5996 | 0.17 | 4.99 | — | 4003 |
| With cement | 0.11 | 1.70 | 0.13 | — | 0.13 | 2.18 | 0.29 | — | 0.15 | 2.65 | 0.44 | — | 0.17 | 4.89 | 1.11 | — |
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