Effects of Coal Mining Height and Width on Overburden Subsidence in Longwall Pier-Column Backfilling

Applied Sciences

Weibing Zhu¹  Limin Wang²  Xiaozhen Wang²  Jialin Xu²  Jianlin Xie² 

[1] School of Mines, China University of Mining and Technology, Xuzhou 221116, China;State Key Laboratory of Coal Resources and Safe Mining, China University of Mining and Technology, Xuzhou 221116, China;

关键词: mining height;    mining width;    longwall mining;    pier-column backfilling;    overburden subsidence;   

DOI  :  10.3390/app11073105

来源: DOAJ

【 摘 要 】

Longwall pier-column backfilling is a partial backfilling technique initially designed in thin coal seam mines. With the increase of mining intensity, the mining height and width of the backfilling working face will also increase. It is necessary to analyze how changes in working face dimensions influence the control effect of overburden subsidence in pier-column backfilling. In this study, a mining model with a combination of 25 conditions (five different mining heights (1~3 m) × five different mining widths (80~240 m)) was designed using a FLAC3D(Vision 5.0) numerical simulation. The simulation was used to analyze the control effect of overburden subsidence with varying mining heights and widths. In addition, according to the field working face conditions, two physical similarity models were performed to explore the overburden subsidence law in pier-column backfilling with different mining heights and widths. It was observed from the above study that mining heights and widths will have a different influence on the overburden subsidence in longwall pier-column backfilling. The result of this study provides strong theoretical support for evaluating the control effect of overburden subsidence in longwall pier-column backfilling.

【 授权许可】

Unknown