Research Article
Permeability Evolution and Particle Size Distribution of Saturated Crushed Sandstone under Compression
Table 7
The values of parameters used to calculate the permeability.
(a) n = 0.2 |
| Axial stress (MPa) | Pore water pressure gradient (MPa/m) | Water flow velocity (10−3 m/s) | Permeability (10−14 m2) |
| 0 | 5 | 4.43 | 56.67 | 10 | 5.59 | 15 | 7.42 | 20 | 12.31 |
| 2 | 5 | 1.42 | 21.16 | 10 | 1.91 | 15 | 2.91 | 20 | 4.21 |
| 4 | 5 | 0.57 | 8.29 | 10 | 0.79 | 15 | 1.03 | 20 | 1.60 |
| 8 | 5 | 0.39 | 5.50 | 10 | 0.47 | 15 | 0.66 | 20 | 0.99 |
| 12 | 5 | 0.27 | 3.48 | 10 | 0.35 | 15 | 0.47 | 20 | 0.78 |
| 16 | 5 | 0.26 | 4.14 | 10 | 0.39 | 15 | 0.51 | 20 | 0.76 |
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(b) n = 0.4 |
| Axial stress (MPa) | Pore water pressure gradient (MPa/m) | Water flow velocity (10−3 m/s) | Permeability (10−14 m2) |
| 0 | 5 | 4.57 | 59.72 | 10 | 5.24 | 15 | 7.29 | 20 | 11.40 |
| 2 | 5 | 1.52 | 23.96 | 10 | 2.19 | 15 | 2.87 | 20 | 4.26 |
| 4 | 5 | 0.72 | 10.37 | 10 | 0.88 | 15 | 1.64 | 20 | 2.24 |
| 8 | 5 | 0.32 | 4.89 | 10 | 0.41 | 15 | 0.63 | 20 | 0.88 |
| 12 | 5 | 0.36 | 5.73 | 10 | 0.49 | 15 | 0.73 | 20 | 1.02 |
| 16 | 5 | 0.32 | 4.77 | 10 | 0.43 | 15 | 0.59 | 20 | 0.88 |
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(c) n = 0.6 |
| Axial stress (MPa) | Pore water pressure gradient (MPa/m) | Water flow velocity (10−3 m/s) | Permeability (10−14 m2) |
| 0 | 5 | 4.45 | 63.40 | 10 | 5.77 | 15 | 8.12 | 20 | 12.28 |
| 2 | 5 | 1.86 | 27.08 | 10 | 2.77 | 15 | 3.39 | 20 | 5.46 |
| 4 | 5 | 0.96 | 12.83 | 10 | 1.11 | 15 | 1.56 | 20 | 2.40 |
| 8 | 5 | 0.52 | 7.52 | 10 | 0.72 | 15 | 0.91 | 20 | 1.43 |
| 12 | 5 | 0.50 | 7.55 | 10 | 0.68 | 15 | 0.99 | 20 | 1.44 |
| 16 | 5 | 0.43 | 6.35 | 10 | 0.48 | 15 | 0.65 | 20 | 0.96 |
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(d) n = 0.8 |
| Axial stress (MPa) | Pore water pressure gradient (MPa/m) | Water flow velocity (10−3 m/s) | Permeability (10−14 m2) |
| 0 | 5 | 3.99 | 67.16 | 10 | 5.85 | 15 | 8.40 | 20 | 11.68 |
| 2 | 5 | 2.32 | 30.15 | 10 | 2.82 | 15 | 4.01 | 20 | 6.37 |
| 4 | 5 | 1.15 | 15.67 | 10 | 1.39 | 15 | 1.93 | 20 | 2.97 |
| 8 | 5 | 0.57 | 8.75 | 10 | 0.81 | 15 | 1.12 | 20 | 1.66 |
| 12 | 5 | 0.62 | 9.09 | 10 | 0.81 | 15 | 1.15 | 20 | 1.70 |
| 16 | 5 | 0.39 | 6.14 | 10 | 0.54 | 15 | 0.71 | 20 | 1.05 |
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