| Zhengzhou Institute of Multipurpose Utilization of Mineral Resources, Chinese Academy of Geological Sciences | Host |
| Citation: |
TAN Gang, LIU Xudong, ZHANG Chaoshan, CUI Zhiwei, WANG Yaochen, LI Xiujuan, ZHANG Jianjia. Numerical Simulation Study on Technology Optimization of Large Section High Fully Mechanized Caving Mining in Vertical Coal Seam[J]. Conservation and Utilization of Mineral Resources, 2025, 45(2): 64-76. doi: 10.13779/j.cnki.issn1001-0076.2025.02.006
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Numerical Simulation Study on Technology Optimization of Large Section High Fully Mechanized Caving Mining in Vertical Coal Seam
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Abstract
Wudong Coal Mine West Mining Area near vertical coal seam adopts horizontal section top−coal caving. In order to improve the production efficiency, the working face with short extension can be replaced by appropriately increasing the height of horizontal section. Therefore, it is necessary to study the top coal migration law of horizontal section top−coal caving in near vertical coal seam under the condition of large section height and optimize the coal caving technique to improve the top coal recovery rate. Combined with the field measured data, the model of coal drawing method under the condition of top coal size distribution of each layer is established. The top coal migration law in the process of initial coal drawing and periodic coal drawing under the condition of large section height are obtained by the Particle Flow Code numerical calculation. The top coal recovery and coal loss of each coal drawing parameter and order are analyzed, and the reasonable coal drawing technique suitable for B3−6 working face of Wudong Coal Mine is put forward. The results show that under the condition of large section height, the bottom of the coal−gangue boundary has a tendency to deflect to the right side during the periodic coal drawing process. The advance of the drawing opening position leads to a small amount of coal drawing in the subsequent multi−steps, and the coal−gangue boundary is seriously lagging behind the drawing opening position. The area of remnant coal is large. Therefore, excessive coal drawing can be appropriately used to alleviate the degree of demarcation of the boundary. When the mining height is 6 m, the development of coal drawing body and the fluidity of top coal are better in the early stage of periodic coal drawing, and the area of remnant coal is small. When the coal drawing interval is 2.4 m, the discharge amount of coal for each step is more and it is helpful to alleviate the problem of too fast seeing gangue. The coal drawing of “subsection drawing with large interval” can effectively reduce the influence of coal−gangue boundary line. The area of remnant coal is the smallest and the recovery of top coal reaches 93.23%.
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References
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TAN Gang, LIU Xudong, ZHANG Chaoshan, CUI Zhiwei, WANG Yaochen, LI Xiujuan, ZHANG Jianjia. Numerical Simulation Study on Technology Optimization of Large Section High Fully Mechanized Caving Mining in Vertical Coal Seam[J]. Conservation and Utilization of Mineral Resources, 2025, 45(2): 64-76. doi: 10.13779/j.cnki.issn1001-0076.2025.02.006
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Figure 1.
Distribution map of the three major mining areas in Wudong Coal Mine
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Figure 2.
Geological profile of the western mining area of Wudong Coal Mine
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Figure 3.
Mining layout of the western mining area of Wudong Coal Mine
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Figure 4.
Measured curve of top coal lumpiness distribution of size distribution (a) and component (b)
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Figure 5.
Initial model of large section height mining
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Figure 6.
Morphology of the coal gangue dividing line for periodic coal drawing: (a—the 1st coal drawing; b—2nd coal drawing; c—3rd coal drawing; d—4th coal drawing; e—5th coal drawing; f—6th coal drawing; g—7th coal drawing)
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Figure 7.
Morphology of the gangue dividing line for periodic coal drawing (a—the 4th coal drawing; b—the 8th coal drawing; c—the 12th coal drawing)
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Figure 8.
Coordinate plot of coal−gangue demarcation line for periodic coal drawing of the 3rd coal drawing (a) and the 12th coal drawing (b)
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Figure 9.
Morphology of coal−gangue demarcation line of coal drawing at 4 m mining heights (a), 5 m mining heights (b), and 6 m mining heights (c)
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Figure 10.
Inversion of the coal drawing body at each step at 4 m mining height (a), 5 m mining height (b) and 6 m mining height (c)
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Figure 11.
Variation of coal drawing volume by mining height cycle at 4 m mining height (a), 5 m mining height (b), and 6 m mining height (c)
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Figure 12.
Coal gangue morphology after the end of coal drawing at 4 m mining height (a), 5 m mining height (b), and 6 m mining height (c)
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Figure 13.
Inversion of the drawing body at 1.6 m coal drawing interval (a), 2.4 m coal drawing interval (b), and 3.2 m coal drawing interval (c)
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Figure 14.
Variation of coal drawing volume by different periodic coal drawing
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Figure 15.
Coal gangue morphology at the end of each step of coal discharge for 1.6 m coal drawing interval (a), 2.4 m coal drawing interval (b), and 3.2 m coal drawing interval (c)
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Figure 16.
Initial state diagram of the tendency model for nearly upright extra thick coal seams
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Figure 17.
Schematic diagram of coal drawing order
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Figure 18.
Inversion of releasing body under sequential coal drawing (a), partially reverse drawing (b), and subsection drawing with large interval (c)
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Figure 19.
Top coal drawing volume of each bracket with different coal drawing methods
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Figure 20.
Coal gangue morphology of sequential coal drawing (a), partially reverse drawing (b), and subsection drawing with large interval (c)