Parameter design method of supporting coal pillar for end-slope mining under non-uniform load condition
In the process of applying the mining technology of the end-wall shearer to recover the coal resources retained in the end-wall, the reasonable design of the parameters of the supporting coal pillar is the premise of the safe and efficient end-wall mining. Based on the cusp catastrophe theory, the n...
| Main Authors: | , , , , , , |
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| Format: | Article |
| Language: | zho |
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Editorial Department of Coal Science and Technology
2024-12-01
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| Series: | Meitan kexue jishu |
| Subjects: | |
| Online Access: | http://www.mtkxjs.com.cn/article/doi/10.12438/cst.2023-1569 |
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| author | Juyu JIANG Yulong ZHANG Lanzhu CAO Dong WANG Laigui WANG Guanghe LI Chengheng HOU |
| author_facet | Juyu JIANG Yulong ZHANG Lanzhu CAO Dong WANG Laigui WANG Guanghe LI Chengheng HOU |
| author_sort | Juyu JIANG |
| collection | DOAJ |
| description | In the process of applying the mining technology of the end-wall shearer to recover the coal resources retained in the end-wall, the reasonable design of the parameters of the supporting coal pillar is the premise of the safe and efficient end-wall mining. Based on the cusp catastrophe theory, the necessary and sufficient conditions for the instability of the supporting coal pillar in the end slope mining are established. The mechanical analysis model of mining roof-coal pillar was established. Based on the elastic foundation beam theory, the spatial evolution law of roof stress and deformation after local instability of coal pillar was studied, and the instability criterion of mining roof collapse was proposed, which was used as the failure criterion of supporting coal pillar under non-uniform load. The variation law of the limit caving distance of the roof and the length of the coal pillar instability section under different coal pillar widths was studied, and the design method of the supporting coal pillar parameters under non-uniform load was proposed. The results show that the necessary and sufficient condition of coal pillar instability is the bifurcation set Δ < 0, the instability criterion of the roof is that the maximum tensile stress σtmax is greater than the tensile strength σtl , the failure criterion of the coal pillar is that the length lmax of the instability section of the coal pillar is greater than the limit caving distance l2max of the roof of the mining cave , the width of the coal pillar in the end-wall mining of an open-pit coal mine in Shanxi is designed to be 3.0 meters. |
| first_indexed | 2025-02-16T22:15:09Z |
| format | Article |
| id | doaj.art-dd03df488a3e4f5a89fca9856ad92ce4 |
| institution | Directory Open Access Journal |
| issn | 0253-2336 |
| language | zho |
| last_indexed | 2025-02-16T22:15:09Z |
| publishDate | 2024-12-01 |
| publisher | Editorial Department of Coal Science and Technology |
| record_format | Article |
| series | Meitan kexue jishu |
| spelling | doaj.art-dd03df488a3e4f5a89fca9856ad92ce42025-01-15T05:38:22ZzhoEditorial Department of Coal Science and TechnologyMeitan kexue jishu0253-23362024-12-015212233710.12438/cst.2023-15692023-1569Parameter design method of supporting coal pillar for end-slope mining under non-uniform load conditionJuyu JIANG0Yulong ZHANG1Lanzhu CAO2Dong WANG3Laigui WANG4Guanghe LI5Chengheng HOU6School of Mines, Liaoning Technical University, Fuxin 123000, ChinaSchool of Mines, Liaoning Technical University, Fuxin 123000, ChinaSchool of Mines, Liaoning Technical University, Fuxin 123000, ChinaSchool of Mines, Liaoning Technical University, Fuxin 123000, ChinaSchool of Mechanics and Engineering, Liaoning Technical University, Fuxin 123000, ChinaSchool of Mines, Liaoning Technical University, Fuxin 123000, ChinaChina Coal Technology and Engineering Group Shenyang Research Institute Co., Ltd., Fushun 113122, ChinaIn the process of applying the mining technology of the end-wall shearer to recover the coal resources retained in the end-wall, the reasonable design of the parameters of the supporting coal pillar is the premise of the safe and efficient end-wall mining. Based on the cusp catastrophe theory, the necessary and sufficient conditions for the instability of the supporting coal pillar in the end slope mining are established. The mechanical analysis model of mining roof-coal pillar was established. Based on the elastic foundation beam theory, the spatial evolution law of roof stress and deformation after local instability of coal pillar was studied, and the instability criterion of mining roof collapse was proposed, which was used as the failure criterion of supporting coal pillar under non-uniform load. The variation law of the limit caving distance of the roof and the length of the coal pillar instability section under different coal pillar widths was studied, and the design method of the supporting coal pillar parameters under non-uniform load was proposed. The results show that the necessary and sufficient condition of coal pillar instability is the bifurcation set Δ < 0, the instability criterion of the roof is that the maximum tensile stress σtmax is greater than the tensile strength σtl , the failure criterion of the coal pillar is that the length lmax of the instability section of the coal pillar is greater than the limit caving distance l2max of the roof of the mining cave , the width of the coal pillar in the end-wall mining of an open-pit coal mine in Shanxi is designed to be 3.0 meters.http://www.mtkxjs.com.cn/article/doi/10.12438/cst.2023-1569non-uniform loadinghighwall miningcoal pillarcoal pillar failurecoal pillar instabilityparameter design |
| spellingShingle | Juyu JIANG Yulong ZHANG Lanzhu CAO Dong WANG Laigui WANG Guanghe LI Chengheng HOU Parameter design method of supporting coal pillar for end-slope mining under non-uniform load condition Meitan kexue jishu non-uniform loading highwall mining coal pillar coal pillar failure coal pillar instability parameter design |
| title | Parameter design method of supporting coal pillar for end-slope mining under non-uniform load condition |
| title_full | Parameter design method of supporting coal pillar for end-slope mining under non-uniform load condition |
| title_fullStr | Parameter design method of supporting coal pillar for end-slope mining under non-uniform load condition |
| title_full_unstemmed | Parameter design method of supporting coal pillar for end-slope mining under non-uniform load condition |
| title_short | Parameter design method of supporting coal pillar for end-slope mining under non-uniform load condition |
| title_sort | parameter design method of supporting coal pillar for end slope mining under non uniform load condition |
| topic | non-uniform loading highwall mining coal pillar coal pillar failure coal pillar instability parameter design |
| url | http://www.mtkxjs.com.cn/article/doi/10.12438/cst.2023-1569 |
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