Some key problems on estimation of height of water-conducting fractured zone for thick coal seam top coal caving
The height of water-conducting fractured zone is an important indicator for ensuring safe mining of coal resources under water bodies. In view of the problems and deficiencies to quote empirical formula for top coal caving in thick coal seams, the basis of the empirical formula is analyzed and the a...
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| Format: | Article |
| Language: | English |
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Emergency Management Press
2025-08-01
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| Series: | 矿业科学学报 |
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| Online Access: | http://kykxxb.cumtb.edu.cn/en/article/doi/10.19606/j.cnki.jmst.2025036 |
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| author | CUI Ximin CHE Yuhang SUN Shuaihui LI Peixian SUN Hao XU Zhihua YUAN Debao JIANG Jinbao ZHAO Yuling MALINOWSKA A |
| author_facet | CUI Ximin CHE Yuhang SUN Shuaihui LI Peixian SUN Hao XU Zhihua YUAN Debao JIANG Jinbao ZHAO Yuling MALINOWSKA A |
| author_sort | CUI Ximin |
| collection | DOAJ |
| description | The height of water-conducting fractured zone is an important indicator for ensuring safe mining of coal resources under water bodies. In view of the problems and deficiencies to quote empirical formula for top coal caving in thick coal seams, the basis of the empirical formula is analyzed and the applicable conditions, which are large mining areas, single-layer mining thickness of 1~3 m, and cumulative mining thickness not exceed 15 m for coal seam slice mining, are clarified and emphasized. Based on the field measurement results of the top coal caving property and top coal recovery rate, the concept of effective mining thickness for top coal caving in thick coal seams is proposed. The effective mining thickness is closely related to the recovery rate of the top coal caving and the height of the water-conducting fractured zone increases with the increase of the effective mining thickness. It is shown that the height of the water-conducting fractured zone based on the effective mining thickness can effectively avoid the underestimation caused by the increase of the top coal recovery rate in top coal caving. Based on the evolutionary law of the overburden and surface subsidence from subcritical to critical or supercritical mining, the Boltzmann function is introduced to express the relationship between the critical mining degree and the height of water-conducting fractured zone. A method for calculating the maximum height of the water-conducting fractured zone is provided based on the degree of critical mining. Taking fully into account of the recovery rate of the top coal caving and the degree of critical mining, a technical reference is provided for scientifically calculating the maximum height of the water-conducting fractured zone in thick coal seam top coal caving and the safe mining under water bodies or aquifers can be ensured. |
| format | Article |
| id | doaj-art-34e3f3c8c9f64eeda8116d119e6dbcb9 |
| institution | DOAJ |
| issn | 2096-2193 |
| language | English |
| publishDate | 2025-08-01 |
| publisher | Emergency Management Press |
| record_format | Article |
| series | 矿业科学学报 |
| spelling | doaj-art-34e3f3c8c9f64eeda8116d119e6dbcb92025-08-20T02:47:45ZengEmergency Management Press矿业科学学报2096-21932025-08-0110457358310.19606/j.cnki.jmst.2025036kykxxb-10-4-573Some key problems on estimation of height of water-conducting fractured zone for thick coal seam top coal cavingCUI Ximin0CHE Yuhang1SUN Shuaihui2LI Peixian3SUN Hao4XU Zhihua5YUAN Debao6JIANG Jinbao7ZHAO Yuling8MALINOWSKA A9Inner Mongolia Research Institute, China University of Mining and Technology-Beijing, Ordos Inner Mongolia 017000, ChinaInner Mongolia Research Institute, China University of Mining and Technology-Beijing, Ordos Inner Mongolia 017000, ChinaInner Mongolia Research Institute, China University of Mining and Technology-Beijing, Ordos Inner Mongolia 017000, ChinaInner Mongolia Research Institute, China University of Mining and Technology-Beijing, Ordos Inner Mongolia 017000, ChinaInner Mongolia Research Institute, China University of Mining and Technology-Beijing, Ordos Inner Mongolia 017000, ChinaInner Mongolia Research Institute, China University of Mining and Technology-Beijing, Ordos Inner Mongolia 017000, ChinaInner Mongolia Research Institute, China University of Mining and Technology-Beijing, Ordos Inner Mongolia 017000, ChinaInner Mongolia Research Institute, China University of Mining and Technology-Beijing, Ordos Inner Mongolia 017000, ChinaSchool of Mining and Geomatics Engineering, Heibei University of Technology, Handan Hebei 056038, ChinaAGH University of Science and Technology, Cracow 30059, PolandThe height of water-conducting fractured zone is an important indicator for ensuring safe mining of coal resources under water bodies. In view of the problems and deficiencies to quote empirical formula for top coal caving in thick coal seams, the basis of the empirical formula is analyzed and the applicable conditions, which are large mining areas, single-layer mining thickness of 1~3 m, and cumulative mining thickness not exceed 15 m for coal seam slice mining, are clarified and emphasized. Based on the field measurement results of the top coal caving property and top coal recovery rate, the concept of effective mining thickness for top coal caving in thick coal seams is proposed. The effective mining thickness is closely related to the recovery rate of the top coal caving and the height of the water-conducting fractured zone increases with the increase of the effective mining thickness. It is shown that the height of the water-conducting fractured zone based on the effective mining thickness can effectively avoid the underestimation caused by the increase of the top coal recovery rate in top coal caving. Based on the evolutionary law of the overburden and surface subsidence from subcritical to critical or supercritical mining, the Boltzmann function is introduced to express the relationship between the critical mining degree and the height of water-conducting fractured zone. A method for calculating the maximum height of the water-conducting fractured zone is provided based on the degree of critical mining. Taking fully into account of the recovery rate of the top coal caving and the degree of critical mining, a technical reference is provided for scientifically calculating the maximum height of the water-conducting fractured zone in thick coal seam top coal caving and the safe mining under water bodies or aquifers can be ensured.http://kykxxb.cumtb.edu.cn/en/article/doi/10.19606/j.cnki.jmst.2025036top coal cavingheight of water-conducting fractuned zonetop coal recoverycritical mining degreeeffective mining thickness |
| spellingShingle | CUI Ximin CHE Yuhang SUN Shuaihui LI Peixian SUN Hao XU Zhihua YUAN Debao JIANG Jinbao ZHAO Yuling MALINOWSKA A Some key problems on estimation of height of water-conducting fractured zone for thick coal seam top coal caving 矿业科学学报 top coal caving height of water-conducting fractuned zone top coal recovery critical mining degree effective mining thickness |
| title | Some key problems on estimation of height of water-conducting fractured zone for thick coal seam top coal caving |
| title_full | Some key problems on estimation of height of water-conducting fractured zone for thick coal seam top coal caving |
| title_fullStr | Some key problems on estimation of height of water-conducting fractured zone for thick coal seam top coal caving |
| title_full_unstemmed | Some key problems on estimation of height of water-conducting fractured zone for thick coal seam top coal caving |
| title_short | Some key problems on estimation of height of water-conducting fractured zone for thick coal seam top coal caving |
| title_sort | some key problems on estimation of height of water conducting fractured zone for thick coal seam top coal caving |
| topic | top coal caving height of water-conducting fractuned zone top coal recovery critical mining degree effective mining thickness |
| url | http://kykxxb.cumtb.edu.cn/en/article/doi/10.19606/j.cnki.jmst.2025036 |
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