Calculation of subsidiary mining stress in floor roadway under the remaining boundary pillar of close coal seam mining

被引：0

作者：

Yue X. ^{[1
,2
]}

Tu M. ^{[1
]}

Li Y. ^{[1
]}

Zhang J. ^{[3
]}

Gao L. ^{[4
]}

机构：

[1] Key Laboratory of Mine Safety and High Efficient Mining Jointly Built by Anhui Province and Ministry of Education, Anhui University of Science and Technology, Huainan

[2] Xinji Second Coalmine, China Coal Energy Co Ltd, Huainan

[3] China Coal Technology & Engineering Group Chongqing Research Institute Co Ltd, Chongqing

[4] Shenhua Shendong Coal Group Co Ltd, Shenmu

来源：

Caikuang yu Anquan Gongcheng Xuebao/Journal of Mining and Safety Engineering | 2021年 / 38卷 / 02期

关键词：

Elliptic stress arch; Horizontal offset; Rock fracture; Subsidiary stress;

D O I：

10.13545/j.cnki.jmse.2019.0501

中图分类号：

学科分类号：

摘要：

After the mining of the overlying coal seam, six areas are formed in the coal seam floor: original rock stress area, elastic stress increase area, plastic area, pressure relief area, stress recovery area, and compaction area. The "elliptic stress arch structure" is formed in the surrounding rock near the remaining boundary pillar of overlying coal seam, with the front arch foot in the stress recovery area and the back arch foot in the elastic stress increase area. The overlying load is transmitted to the floor through the front and back arch feet, and produces subsidiary stress to the roadway of lower coal seam, which obviously affects the stability of the roadway with underlying coal seam. On this basis, the structural mechanics model of elliptical stress arch in overlying coal seam is constructed, and the shape parameters of elliptic stress arch, such as center coordinate, axis length and arch foot position, are calculated through numerical simulation. On top of this, the width of each area of overlying coal seam floor and its equivalent load are determined, and the subsidiary stress of roadway with underlying coal seam is calculated. The results have shown that the subsidiary stress of floor roadway is closely related to the mining height of overlying coal seam, the spacing of coal seam, and the horizontal offset of roadway. According to the specific mining conditions of Buertai Coalmine and the stability criterion of surrounding rock, the horizontal offset between the open-off cut of the underlying 42 coal and the boundary pillar of the overlying 22 coal is reasonably determined. © 2021, Editorial Board of Journal of Mining & Safety Engineering. All right reserved.

引用

页码：246 / 252and259

共 13 条

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