LIU C, LI H M, MA Z Y,et al.Numerical simulation study on reasonable top coal caving technology in longwall top coal caving working face with different top coal thickness[J].Journal of Henan Polytechnic University(Natural Science) ,2023,42(4):40-46.

doi:10.16186/j.cnki.1673-9787.2021120103

Received:2021/12/27

Revised:2022/10/14

Published:2023/07/25

Numerical simulation study on reasonable top coal caving technology in longwall top coal caving working face with different top coal thickness

LIU Chuang1, LI Huamin2, MA Zhanyuan3, ZHANG Zhenrui1

1.School of Resource and Safety Engineering，Henan University of Engineering，Zhengzhou  451191，Henan，China;2.School of Energy Science and Engineering，Henan Polytechnic University，Jiaozuo  454000，Henan，China;3.Jinneng Holding Group，Datong  037003，Shanxi，China

Abstract:The recovery rate of top coal in 8202 longwall top coal caving（LTCC）working face of Tongxin coal mine is low.In order to improve the recovery rate of coal resources，a numerical model along the slope of the working face was established by CDEM numerical simulation software.Different top coal caving technology were used to simulate the top coal caving process of the LTCC working face under the top coal thickness of 4.0，8.0，12.0 m，the changes in the coal-gangue interface and the recovery rate of the top coal were compared and analyzed，and the reasonable coal drawing process parameters under different top coal thickness were optimized.The results showed that the greater the thickness of the top coal caving at one time was，the greater the difference in the amount of top coal caving at each caving window was，the more serious the coal-gangue interbedding was，the more chaotic the coal-gangue interface was and the lower top coal recovery rate was.Through analysis and comparison，it was concluded that the top coal recovery rate of 8202 LTCC working face was the largest under the three-round sequential top coal caving technology.

Key words:longwall top coal caving working face;coal thickness;coal caving technology;top coal recovery rate;numerical simulation

不同煤厚综放工作面合理放煤工艺数值模拟研究_刘闯.pdf