Stability analysis of crown pillar under the zone of relaxation around sub-level open stopes using numerical modelling
| Autor: | Vishal Babu Guggari, Hemant Kumar, Gnananandh Budi |
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| Jazyk: | angličtina |
| Rok vydání: | 2023 |
| Předmět: | |
| Zdroj: | Geomatics, Natural Hazards & Risk, Vol 14, Iss 1 (2023) |
| Druh dokumentu: | article |
| ISSN: | 19475705 1947-5713 1947-5705 |
| DOI: | 10.1080/19475705.2023.2234072 |
| Popis: | AbstractThe stability of stopes and pillars is a critical concern in deep underground metal mining due to the potential for stress concentration and relaxation that can cause the dynamic failure of pillars. This study employs a finite element approach to investigate the behaviour of crown pillars to various stress and geo-mining parameters. The analysis includes examining stresses, deformations, and yielding zones around the crown pillars using variations in rock mass parameters. The study involves 240 non-linear numerical models with the Mohr–Coulomb elastoplastic failure criteria under plane strain conditions. The results indicate that increasing the crown pillar thickness from 5 to 8 m reduces maximum vertical deformation by 55.8% and the maximum extent of yielding zones from 2.2 to 0 m. The study suggests a 6 m crown pillar for depths up to 670.56 m and thicker pillars of 7 m or more for greater depths. |
| Databáze: | Directory of Open Access Journals |
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