采空区侧留巷围岩破坏机理及补强支护方案

吴祥业; 吴　林; 刘伟锋; 郭文彬; 李建伟; 王婧雅

采空区侧留巷围岩破坏机理及补强支护方案

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出版历程
- 发布日期: 2020-12-19

Failure Mechanism of Surrounding Rock and Reinforcement Support Scheme of Roadway in Goaf Side

摘要

摘要: 针对受侧方采动影响巷道变形量大、支护困难等问题,以补连塔煤矿22304回风平巷为研究背景,通过理论分析及数值模拟方法获得巷道围岩应力分布规律,并从多维角度分析采空区侧留巷围岩不同位置、主应力差值及塑性区三者之间的关系,得出围岩破坏机理,进一步对其补强支护围岩控制效果进行分析。结果表明:采空区侧留巷围岩应力分布在空间上呈现一定规律性,主应力变化幅度较大位置出现在工作面后方,主应力差值在煤壁后方约300 m处达到稳定;主应力差值与塑性区尺寸具有正相关性;工作面后方围岩主应力大小和方向变化导致塑性区非对称分布特征;进而确定补强支护关键部位,经分析该补强方案具有较强针对性,可达到协同控制两帮及顶板的目的,保证围岩稳定性。
- 采动巷道 /
- 数值模拟 /
- 围岩破坏 /
- 塑性区 /
- 支护设计
Abstract: Aiming at the problems of roadway deformation and support difficulty under the influence of lateral mining, taking 22304 return air roadway of Bulianta Coal Mine as the research background, through theoretical analysis and numerical simulation method, the distribution law of surrounding rock stress is obtained, and the relationship among different positions of surrounding rock, main stress difference and plastic area is analyzed from multi-dimensional perspective, and the failure mechanism of surrounding rock is obtained, and the control effect of surrounding rock reinforcement is further analyzed. The results show that the stress distribution of the surrounding rock in the side entry of the goaf shows a certain regularity in space, the main stress changes a lot in the rear of the working face, and the main stress difference is stable about 300 m behind the coal wall; the main stress difference has a positive correlation with the size of the plastic area; the main stress size and direction change of the surrounding rock behind the working face lead to the asymmetric distribution characteristics of the plastic area; then, the key parts of the reinforcement support are determined. Through analysis, the reinforcement scheme is highly targeted and can achieve the purpose of synergistic control of the two sides and the roof to ensure the stability of surrounding rocks.
- mining roadway /
- numerical simulation /
- surrounding rock failure /
- plastic zone /
- support design

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参考文献(20)

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