Research Article
Engineering Characteristics and Application Analysis of Red Sandstone in the Lanzhou Metro
Table 7
Classification of red sandstone.
| | Category | Dry density/(g·cm-3) | Permeability coefficient/(cm·s-1) | Disintegration speed/h | Natural uniaxial compressive strength/MPa |
| | I | ≤1.9 | ≥10-4 | ≤1 | ≤0.1 | | II | 1.9-2.1 | 10-4-10-5 | 1-24 | 0.1-1 | | III | ≥2.1 | ≤10-5 | Slow disintegration | ≥1 |
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