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| Optimization design of coal pillar size in lower section of goaf in close distance coal seam |
| Wang Guiping1,2 |
| 1. Mine Management Branch, Jizhong Energy Handan Mining Group, Handan 056105，China; 2. Anshen Coal Mine, Shanxi Tongzhou Group, Changzhi 046500，China |
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Abstract The mining conditions of working face under goaf of Tangshangou Mine were studied. The goaf coal pillar size of the fully mechanized mining face in the close distance coal seam was calculated by the plastic zone formula calculated by Mohr-Coulomb criterion on the side of the goaf and the side of the roadway. the width of coal pillar was 14.23 m. The variation law of surrounding rock stress and failure field distribution with coal pillar width is obtained using UDEC2d numerical software. Results showed that the stress concentration of coal pillar increased sharply when the width of coal pillar exceeded 14m, and the stress distribution of surrounding rock varied with the width of coal pillar, the plastic zone on both sides of elastic core separated obviously when the length of elastic core exceeded 15m, and the optimal width of coal pillar was finally determined to be 15m. The research results could provide reference for coal pillar setting in other similar working face.
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| 1 ] 柏建彪. 沿空掘巷围岩控制[ M ]. 徐州：中国矿业大学出版社， 2006.
[ 2 ] 李学华，鞠明和，贾尚昆，等. 沿空掘巷窄煤柱稳定性影响因素及工程应用研究[ J ]. 采矿与安全工程学报，2016，33（ 5 ）：761 - 769.
[ 3 ] 祁方坤，周跃进，曹正正，等. 综放沿空掘巷护巷窄煤柱留设宽度优化设计研究[ J ]. 采矿与安全工程学报，2016，33（ 3 ）：475 - 480.
[ 4 ] 杜江涛. 近距离采空区下综放工作面煤柱尺寸优化设计[ J ]. 煤炭工程，2019，51（ 7 ）：11 - 14.
[ 5 ] 张培森. 近距煤层巷道煤柱尺寸的优化设计[ J ]. 矿山压力与顶板管理，2004，3（ 1 ）：26 - 28.
[ 6 ] 裴 治. 王村煤矿煤柱稳定性和煤柱尺寸优化研究[ J ]. 山东煤炭科技，2020，5（ 2 ）：16 - 18. |
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