| 沿空留巷上覆岩层关键块稳定性力学分析及巷旁充填体宽度确定 |
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| 引用本文： | 李迎富,华心祝.沿空留巷上覆岩层关键块稳定性力学分析及巷旁充填体宽度确定[J].岩土力学,2012,33(4):1134-1140. |
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| 作者姓名： | 李迎富 华心祝 |
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| 作者单位： | 安徽理工大学 能源与安全学院，安徽 淮南 232001 |
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| 基金项目： | 国家自然基金重点资助项目(No.50774001) |
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| 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。
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| 关 键 词： | 沿空留巷 关键块稳定性力学分析 充填体宽度 稳定性系数 影响因素的敏感度 |
| 收稿时间： | 2011-07-17 |
Mechanical analysis of stability of key blocks of overlying strata for gob-side entry retaining and calculating width of roadside backfill |
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| LI Ying-fu
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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].Rock and Soil Mechanics,2012,33(4):1134-1140. |
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| Authors: | LI Ying-fu HUA Xin-zhu |
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| Institution: | School of Energy and Safety, Anhui University of Science and Technology, Huainan, Anhui 232001, China |
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| 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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| Keywords: | gob-side entry retaining mechanical analysis of the stability of key block width of roadside backfill stability coefficient sensitive coefficient of influencing factors |
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