自锚式加固结构对滑坡区隧道的治理效果研究

Study on Effect of Self-anchored Reinforcement Structure for the Tunnel in a Landslide Area

滑坡区隧道存在变形破坏等病害,文章采用自锚式新型加固结构对位于深厚滑坡体滑面上部附近的隧道进行加固处置,并通过理论计算和数值计算就自锚式加固结构的加固效果进行研究分析。理论计算结果表明:采用新型加固结构后,隧道内力分布更加均布合理,变形也得到了有效的约束,验证了新型加固结构具有良好的加固效果。数值计算结果表明:采用新型加固结构后,隧道内力分布更加合理,最大主应力明显减小,应力集中区消失,同时变形也得到了有效的约束;新型加固结构的作用范围仅体现在隧道围岩及下部岩土,滑坡最终将发生越顶破坏,验证了自锚式新型加固结构只加固隧道而不治理滑坡的加固理念。

Deformation and failure often occur in the tunnel at a landslide area.The self-anchored reinforcement structure was adopted to reinforce the tunnel located at the upper surface of deep and thick landslide mass.Study and analysis were conducted regarding the effect of self-anchored reinforcement structure based on theoretical calculation and numerical simulation.The theoretical calculation results show that the distribution of internal force ismore uniform and reasonable and deformation is effectively restrained after taking the new type reinforcement structure,verifying the effect of self-anchored reinforcement structure.The numerical calculation results show that the distribution of internal force is more reasonable,the maximum principal stress decreases significantly,the area of stress concentration eliminates and deformation is effectively restrained after taking the new type reinforcement structure;effective scope of this reinforced structure is only at tunnel surrounding rock and the lower rock soil,land-slide may finally cause overtopping failure,varying the concept that the self-anchored reinforcement structure is only to reinforce tunnel instead of landslide control.