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

被引：10
|
作者：
Wang, Xiaozhen [1 ,2 ]
Xie, Jianlin [1 ]
Xu, Jialin [1 ]
Zhu, Weibing [2 ]
Wang, Limin [1 ,2 ]
机构：
[1] China Univ Min & Technol, State Key Lab Coal Resources & Safe Min, Xuzhou 221116, Jiangsu, Peoples R China
[2] China Univ Min & Technol, Sch Mines, Xuzhou 221116, Jiangsu, Peoples R China
来源：
APPLIED SCIENCES-BASEL | 2021年 / 11卷 / 07期
基金：
中国国家自然科学基金;
关键词：
mining height; mining width; longwall mining; pier-column backfilling; overburden subsidence;
D O I：
10.3390/app11073105
中图分类号：
O6 [化学];
学科分类号：
0703 ;
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 similar to 3 m) x five different mining widths (80 similar to 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.
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页数：11
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