基于弹性孔理论巷道围岩结构失稳数值计算

Numerical Calculation of Structural Instability of Roadway Surrounding Rock Based on Elastic Hole Theory

针对巷道围岩结构失稳问题,基于弹性孔理论系统总结了开挖扰动诱发片帮的4种类型,分析顶板结构、巷道围岩失稳机制;采用FLAC3D有限元数值计算软件分析巷道围岩结构失稳机理和灾变特征,巷道经过支护后顶板运移量大幅度减小,同时减缓覆岩整体性破坏程度。结果表明,受巷道掘进扰动影响下顶板更易发生结构失稳,巷道支护能够有效阻碍覆岩顶、底板运移,缓解岩体灾变概率,动力灾害得到有效控制,巷道实现安全掘进。

Aiming at the instability of roadway surrounding rock structure, based on elastic hole theory,four types of excavated perturbation induced slab are summarized, and roof structure and instability mechanism of roadway surrounding rock are analyzed. FLAC3D finite element numerical calculation software was used to analyze the instability mechanism and catastrophic characteristics of the surrounding rock structure of the roadway. After the roadway was supported, the roof movement was greatly reduced, while the overall failure degree of overburden was slowed down. The results show that the roof is more prone to structural instability under the influence of roadway tunneling disturbance.Roadway support can effectively block the movement of overburden roof and floor, alleviate the probability of rock mass disaster, effectively control the dynamic disaster, and realize safe tunneling.