Effects of caving–mining ratio on the coal and waste rocks gangue flows and the amount of cyclically caved coal in fully mechanized mining of super-thick coal seams
Aimed at determining the appropriate caving–mining ratio for fully mechanized mining of 20 m thick coal seam, this research investigated the effects of caving–mining ratio on the flow fields of coal and waste rocks, amount of cyclically caved coal and top coal loss by means of numerical modeling. Th...
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| Format: | Article |
| Language: | English |
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Elsevier
2015-01-01
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| Series: | International Journal of Mining Science and Technology |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2095268614001839 |
| _version_ | 1819224796446064640 |
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| author | Ningbo Zhang Changyou Liu Mengsong Pei |
| author_facet | Ningbo Zhang Changyou Liu Mengsong Pei |
| author_sort | Ningbo Zhang |
| collection | DOAJ |
| description | Aimed at determining the appropriate caving–mining ratio for fully mechanized mining of 20 m thick coal seam, this research investigated the effects of caving–mining ratio on the flow fields of coal and waste rocks, amount of cyclically caved coal and top coal loss by means of numerical modeling. The research was based on the geological conditions of panel 8102 in Tashan coal mine. The results indicated the loose coal and waste rocks formed an elliptical zone around the drawpoint. The ellipse enlarged with decreasing caving–mining ratio. And its long axis inclined to the gob gradually became vertical and facilitating the caving and recovery of top coal. The top coal loss showed a cyclical variation; and the loss cycle was shortened with the decreasing in caving–mining ratio. Moreover, the mean squared error (MSE) of the amount of cyclically caved coal went up with increasing caving–mining ratio, indicating a growing imbalance of amount of cyclically caved coal, which could impede the coordinated mining and caving operations. Finally it was found that a caving–mining ratio of 1:2.51 should be reasonable for the conditions. Keywords: Caving–mining ratio, Coal and waste rocks flows, Amount of cyclically caved coal, Zone of loose coal and waste rocks |
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| format | Article |
| id | doaj.art-5a54fa4cfb2242b8af926fc19a9a08a7 |
| institution | Directory Open Access Journal |
| issn | 2095-2686 |
| language | English |
| last_indexed | 2024-12-23T09:59:24Z |
| publishDate | 2015-01-01 |
| publisher | Elsevier |
| record_format | Article |
| series | International Journal of Mining Science and Technology |
| spelling | doaj.art-5a54fa4cfb2242b8af926fc19a9a08a72022-12-21T17:51:18ZengElsevierInternational Journal of Mining Science and Technology2095-26862015-01-01251145150Effects of caving–mining ratio on the coal and waste rocks gangue flows and the amount of cyclically caved coal in fully mechanized mining of super-thick coal seamsNingbo Zhang0Changyou Liu1Mengsong Pei2State Key Laboratory of Coal Resources and Mine Safety, China University of Mining and Technology, Xuzhou 221116, China; School of Mines, China University of Mining and Technology, Xuzhou 221116, China; Key Laboratory of Deep Coal Resource Mining, Ministry of Education, China University of Mining and Technology, Xuzhou 221116, ChinaCorresponding author. Tel.: +86 18952231828.; State Key Laboratory of Coal Resources and Mine Safety, China University of Mining and Technology, Xuzhou 221116, China; School of Mines, China University of Mining and Technology, Xuzhou 221116, China; Key Laboratory of Deep Coal Resource Mining, Ministry of Education, China University of Mining and Technology, Xuzhou 221116, ChinaState Key Laboratory of Coal Resources and Mine Safety, China University of Mining and Technology, Xuzhou 221116, China; School of Mines, China University of Mining and Technology, Xuzhou 221116, China; Key Laboratory of Deep Coal Resource Mining, Ministry of Education, China University of Mining and Technology, Xuzhou 221116, ChinaAimed at determining the appropriate caving–mining ratio for fully mechanized mining of 20 m thick coal seam, this research investigated the effects of caving–mining ratio on the flow fields of coal and waste rocks, amount of cyclically caved coal and top coal loss by means of numerical modeling. The research was based on the geological conditions of panel 8102 in Tashan coal mine. The results indicated the loose coal and waste rocks formed an elliptical zone around the drawpoint. The ellipse enlarged with decreasing caving–mining ratio. And its long axis inclined to the gob gradually became vertical and facilitating the caving and recovery of top coal. The top coal loss showed a cyclical variation; and the loss cycle was shortened with the decreasing in caving–mining ratio. Moreover, the mean squared error (MSE) of the amount of cyclically caved coal went up with increasing caving–mining ratio, indicating a growing imbalance of amount of cyclically caved coal, which could impede the coordinated mining and caving operations. Finally it was found that a caving–mining ratio of 1:2.51 should be reasonable for the conditions. Keywords: Caving–mining ratio, Coal and waste rocks flows, Amount of cyclically caved coal, Zone of loose coal and waste rockshttp://www.sciencedirect.com/science/article/pii/S2095268614001839 |
| spellingShingle | Ningbo Zhang Changyou Liu Mengsong Pei Effects of caving–mining ratio on the coal and waste rocks gangue flows and the amount of cyclically caved coal in fully mechanized mining of super-thick coal seams International Journal of Mining Science and Technology |
| title | Effects of caving–mining ratio on the coal and waste rocks gangue flows and the amount of cyclically caved coal in fully mechanized mining of super-thick coal seams |
| title_full | Effects of caving–mining ratio on the coal and waste rocks gangue flows and the amount of cyclically caved coal in fully mechanized mining of super-thick coal seams |
| title_fullStr | Effects of caving–mining ratio on the coal and waste rocks gangue flows and the amount of cyclically caved coal in fully mechanized mining of super-thick coal seams |
| title_full_unstemmed | Effects of caving–mining ratio on the coal and waste rocks gangue flows and the amount of cyclically caved coal in fully mechanized mining of super-thick coal seams |
| title_short | Effects of caving–mining ratio on the coal and waste rocks gangue flows and the amount of cyclically caved coal in fully mechanized mining of super-thick coal seams |
| title_sort | effects of caving mining ratio on the coal and waste rocks gangue flows and the amount of cyclically caved coal in fully mechanized mining of super thick coal seams |
| url | http://www.sciencedirect.com/science/article/pii/S2095268614001839 |
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