Structural stability of surrounding rock in shallow and thin bedrock gob-side entry driving

被引：0

作者：

Zhang J. ^{[1
]}

Liu Q. ^{[1
,2
]}

Sun Y. ^{[1
]}

Cai W. ^{[1
]}

Zhang J. ^{[1
]}

Chen C. ^{[1
]}

机构：

[1] School of Energy Engineering, Xi'an University of Science and Technology, Xi'an, 710054, Shaanxi

[2] Shaanxi Guojiahe Coal Industry Co Ltd, Baoji, 721500, Shaanxi

来源：

Caikuang yu Anquan Gongcheng Xuebao/Journal of Mining and Safety Engineering | 2020年 / 37卷 / 04期

关键词：

Gob-side entry driving; Shallow buried coal seam; Stability; Surrounding rock structure; Thin bedrock;

D O I：

10.13545/j.cnki.jmse.2020.04.001

中图分类号：

学科分类号：

摘要：

In order to analyze the formation and instability mechanism of surrounding rock structure of gob-side entry driving in shallow and thin bedrock, based on the fracture characteristics of overburden rock of shallow and thin bedrock gob-side entry driving, the stress model of surrounding rock structure of narrow pillar-solid coal-basic roof-overburden rock, i.e., the structure model of "overhanging beam" has been established. Through the mechanical analysis of the overhanging beam structure, the coupling mechanism between the basic roof and the narrow coal pillar on the stability of surrounding rock has been revealed, and the calculation formula of the lateral limit suspension span of the basic roof, the pressure and width of the narrow coal pillar and other parameters have been determined. The analytical conditions and stability judgement conditions for the equilibrium of the overhanging beam structural system have been derived. And it has been found that the strength relationship between the width of narrow coal pillar and the compressive strength of coal pillar is inversely proportional, and it increases with the increase of the shear strength of the basic roof. The practice of determining the width of narrow coal pillar in working face 30100 of Nanliang coal mine has shown that the lateral limit suspension span of the basic roof determined based on the overhanging beam structure model is approximately equal to itsperiodic step, and the width of the narrow coal pillar is reasonable. © 2020, Editorial Board of Journal of Mining & Safety Engineering. All right reserved.

引用

页码：647 / 654

页数：7

共 19 条

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