| Autor: |
Zou, Junpeng, Wang, Man, Bai, Lu, Yan, Chongwei, Cheng, Hongzhan, Dang, Wengang |
| Předmět: |
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| Zdroj: |
Frontiers in Earth Science; 2024, p1-13, 13p |
| Abstrakt: |
The surface subsidence caused by the coal seam mining seriously affects the ecology of the mining area. Compared with the single-coal seam mining, the mechanism of the overburden fracture and crack propagation caused by multi-coal seams mining is more complex, which has not been fully understood. Taking the 22,108 and 42,108 working faces of Buertai Coal Mine as a research object, the discrete element method is used to simulate the migration and failure characteristics of overlying strata, and the propogation of cracks in the process of multi-coal seams mining is also been investigated. So many cracks develop in the soft strata overlying the coal seam, and they cross each other and form a complex fracture system. The hard layer produces staggered cracks with a large size, mainly high-angle longitudinal cracks. The surface subsidence curve of the single coal seam mining shows a wide and slow "bowl" type, and the surface subsidence curve of the double coal seams mining show a "funnel" type with only one inflection point. The overburden structure disturbance caused by the previous coal seam and rock cracking -- settlement have great influence on the mining of the latter coal seam. The research results are basically consistent with the field data comparison, which could provide a reference for the related research and engineering practice of shallow-buried double coal seam mining. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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