李家壕矿22中116工作面末采期间 回撤通道围岩破坏特征
Characteristics of surrounding rock failure of retracement channel during end mining of 22116 working face in Lijiahao Mine
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摘要: 为了掌握李家壕煤矿综采工作面末采期间回撤通道围岩应力分布及破坏特征,采用了理论分析、数值模拟和现场监测验证的方法进行分析研究。研究得出:回撤通道围岩的变形破坏和应力分布状态随工作面推进而不断发生变化。随工作面推进,回撤通道围压比不断增大,从而导致巷道围岩破坏范围不断增大,尤其当距贯通剩余5 m左右时,随着围压比值的增大,巷道围岩变形破坏也随之突然增大。经现场观测,其结果与数值模拟及理论分析基本吻合。
Abstract: In order to grasp the stress distribution and failure characteristics of the surrounding rock during the final mining in the fully mechanized coal mining face of Lijiahao Coal Mine, the paper uses theoretical analysis, numerical simulation and on-site monitoring and verification methods for analysis and research. The study concluded that: the deformation failure and stress distribution state of the surrounding rock of the retracement channel change continuously as the working surface advances. Advance with the work surface, the confining pressure ratio of the retracement channel is continuously increasing, resulting in an increasing range of damage to the surrounding rock of the roadway, especially when the distance is about 5 m, the deformation and damage of the surrounding rock will increase suddenly with the increase of the confining pressure ratio, after field observation, the results are basically consistent with numerical simulation and theoretical analysis.
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