All issues Volume 76 (2021) Oil Gas Sci. Technol. – Rev. IFP Energies nouvelles, 76 (2021) 35 Full HTMLClassification of the friction angle by rock composition.
| Classification | Friction angle (degree) | Type of rock |
|---|---|---|
| Low | 20 – 27 | Schists (mica), clay, marl |
| Medium | 27 – 34 | Sandstone, siltstone, chalk, gneiss, slate |
| High | 34 – 40 | Basalt, granite, limestone, conglomerate |
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