Mechanical analysis of stability of key blocks of overlying strata for gob-side entry retaining and calculating width of roadside backfill

LI Ying-fu; HUA Xin-zhu

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Mechanical analysis of stability of key blocks of overlying strata for gob-side entry retaining and calculating width of roadside backfill

更新时间：2026-06-25

- Mechanical analysis of stability of key blocks of overlying strata for gob-side entry retaining and calculating width of roadside backfill
- Vol. 33, Issue 4, (2012)
- 作者机构：
  
  安徽理工大学能源与安全学院,安徽,淮南,232001
- 作者简介：
- 基金信息：
- DOI：
  CLC： TU457
- Online First：26 April 2012，
  
  Published：2012
- 稿件说明：
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LI Ying-fu, HUA Xin-zhu. Mechanical analysis of stability of key blocks of overlying strata for gob-side entry retaining and calculating width of roadside backfill[J]. 2012, 33(4).
DOI：

LI Ying-fu, HUA Xin-zhu. Mechanical analysis of stability of key blocks of overlying strata for gob-side entry retaining and calculating width of roadside backfill[J]. 2012, 33(4). DOI：

摘要

由于沿空留巷服务时间较长，巷道围岩变形较大，合理地计算巷旁充填体宽度至关重要。根据沿空留巷上覆岩层的活动规律，建立了关键块和直接顶的力学模型，分析了关键块与沿空留巷围岩相互作用机制，推导出巷旁支护阻力的计算公式，并引入了关键块稳定性系数K1、K2及其稳定性影响因素的敏感度。研究结果表明，当K1>1时，关键块发生挤压变形失稳；当K2>1时，关键块发生滑落失稳。以淮南谢一矿512（5）工作面为工程背景，确定了合理的巷旁充填体宽度，计算出关键块稳定性系数，获得了各影响因素对关键块稳定性的敏感度。实例分析表明，采高对关键块的稳定性影响较大，在大采高工作面中进行沿空留巷较为困难。

Abstract

Due to long service time of the gob-side entry retaining and large deformation of surrounding rock

it is very important to calculate reasonably the width of roadside backfill. Based on activity rules of overlying strata of the gob-side entry retaining

The paper establishes a mechanical model of key blocks and immediate roof and analyses the interaction mechanism between key blocks and surrounding rock around the gob-side entry retaining

derives calculating formula of the gob-side supporting resistance

and introduces stability coefficients K1

K2 of key blocks and sensitive coefficients of influencing factors. If K1>1

extrusion instability will emerge; If K2>1

sliding instability will emerge. By taking No. 512（5） working face in Xieyi coal mine in

Huainan as project background. The paper determines reasonable width of roadside backfill

calculates stability coefficients of key blocks

and obtains sensitive coefficients of influencing factors on the stability of key blocks. The case study shows that the mining height has great influence on the stability of key blocks

so applying the technique of the gob-side entry retaining to working face with large mining height is of significant difficulty.

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Related Author

YANG Sen

LIU Qin-jie

LI Ying-fu

HUA Xin-zhu

YANG Peng

JI Ming

ZHANG Nian-chao

YAO Ya-hu

Related Institution

Hunan Key Laboratory of Safe Mining Techniques of Coal Mines, Hunan University of Science and Technology

MOE Laboratory of Deep Coal Resource and Mining of Education, China University of Mining & Technology

Jiulishan Coalmining, Jiaozuo Coal Industrial (Group) Co.

State Key Laboratory of Coal Resources and Safe Mining, China University of Mining and Technology

School of Mines, China University of Mining and Technology

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