Study on the influence of mining sequence and depth on slope stability of end slope in open-pit mines
The end wall mining technology has the advantages of no additional stripping, safety and stability, and no support, and has a good application prospect in the recovery of coal resources in the end wall of open pit mine. During the mining process, the rock body of the slope is subjected to the double...
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Editorial Office of Safety in Coal Mines
2024-12-01
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| Series: | Meikuang Anquan |
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| Online Access: | https://www.mkaqzz.com/cn/article/doi/10.13347/j.cnki.mkaq.20240766 |
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| author | Zhongxin WANG Zhongchao CAI Dong WANG |
| author_facet | Zhongxin WANG Zhongchao CAI Dong WANG |
| author_sort | Zhongxin WANG |
| collection | DOAJ |
| description | The end wall mining technology has the advantages of no additional stripping, safety and stability, and no support, and has a good application prospect in the recovery of coal resources in the end wall of open pit mine. During the mining process, the rock body of the slope is subjected to the double influence of mining excavation and open pit mining, which generates complex stress changes, and there is a risk of slope deformation and destabilization. Therefore, the selection of appropriate mining methods and parameters is crucial for the slope stability of end slope coal recovery. We put forward the calculation formula of coal pillar stress under sequential mining and jumping mining, and use FLAC3D software to calculate and analyze the coal pillar stability under the two methods, and study the slope stability under different mining tunnel depths in the limit state of mining. The results show that: the theoretical coal pillar stress of mining tunnel jumping is smaller than that of sequential mining due to the wider support pressure bearing interval, and the numerical calculation shows that the overall coal pillar of jumping mining is in a stable state, and compared with sequential mining, the maximum peak compressive stress of the mining tunnel is reduced by 16.97%, and there is no obvious stress concentration area, and the amount of subsidence and bottom bulge is reduced by 34.16% and 17.63%, respectively; the depth of the mining tunnel significantly affects the slope deformation amount, deformation area and its stability, and the projected position of the slope top line overlaps with the potential slip surface of the mine end slope, and the growth rate of the slope-facing displacement, settlement and floor bulge increases significantly in this interval, and the stability of the slope decreases rapidly. |
| format | Article |
| id | doaj-art-6cedb55a7bca45418cc64ac963e0120f |
| institution | Kabale University |
| issn | 1003-496X |
| language | zho |
| publishDate | 2024-12-01 |
| publisher | Editorial Office of Safety in Coal Mines |
| record_format | Article |
| series | Meikuang Anquan |
| spelling | doaj-art-6cedb55a7bca45418cc64ac963e0120f2024-12-17T08:29:18ZzhoEditorial Office of Safety in Coal MinesMeikuang Anquan1003-496X2024-12-01551218018710.13347/j.cnki.mkaq.20240766lMKAQ20240766Study on the influence of mining sequence and depth on slope stability of end slope in open-pit minesZhongxin WANG0Zhongchao CAI1Dong WANG2College of Mining, Liaoning Technical University, Fuxin 123000, ChinaChina Coal Technology and Engineering Group Shenyang Design & Research Institute, Shenyang 110015, ChinaCollege of Mining, Liaoning Technical University, Fuxin 123000, ChinaThe end wall mining technology has the advantages of no additional stripping, safety and stability, and no support, and has a good application prospect in the recovery of coal resources in the end wall of open pit mine. During the mining process, the rock body of the slope is subjected to the double influence of mining excavation and open pit mining, which generates complex stress changes, and there is a risk of slope deformation and destabilization. Therefore, the selection of appropriate mining methods and parameters is crucial for the slope stability of end slope coal recovery. We put forward the calculation formula of coal pillar stress under sequential mining and jumping mining, and use FLAC3D software to calculate and analyze the coal pillar stability under the two methods, and study the slope stability under different mining tunnel depths in the limit state of mining. The results show that: the theoretical coal pillar stress of mining tunnel jumping is smaller than that of sequential mining due to the wider support pressure bearing interval, and the numerical calculation shows that the overall coal pillar of jumping mining is in a stable state, and compared with sequential mining, the maximum peak compressive stress of the mining tunnel is reduced by 16.97%, and there is no obvious stress concentration area, and the amount of subsidence and bottom bulge is reduced by 34.16% and 17.63%, respectively; the depth of the mining tunnel significantly affects the slope deformation amount, deformation area and its stability, and the projected position of the slope top line overlaps with the potential slip surface of the mine end slope, and the growth rate of the slope-facing displacement, settlement and floor bulge increases significantly in this interval, and the stability of the slope decreases rapidly.https://www.mkaqzz.com/cn/article/doi/10.13347/j.cnki.mkaq.20240766slope stabilityend slope miningsequential miningmining tunnel jumping miningnumerical simulationcoal pillar stability |
| spellingShingle | Zhongxin WANG Zhongchao CAI Dong WANG Study on the influence of mining sequence and depth on slope stability of end slope in open-pit mines Meikuang Anquan slope stability end slope mining sequential mining mining tunnel jumping mining numerical simulation coal pillar stability |
| title | Study on the influence of mining sequence and depth on slope stability of end slope in open-pit mines |
| title_full | Study on the influence of mining sequence and depth on slope stability of end slope in open-pit mines |
| title_fullStr | Study on the influence of mining sequence and depth on slope stability of end slope in open-pit mines |
| title_full_unstemmed | Study on the influence of mining sequence and depth on slope stability of end slope in open-pit mines |
| title_short | Study on the influence of mining sequence and depth on slope stability of end slope in open-pit mines |
| title_sort | study on the influence of mining sequence and depth on slope stability of end slope in open pit mines |
| topic | slope stability end slope mining sequential mining mining tunnel jumping mining numerical simulation coal pillar stability |
| url | https://www.mkaqzz.com/cn/article/doi/10.13347/j.cnki.mkaq.20240766 |
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