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基于水平层状围岩结构特征,分析了层状围岩中隧道开挖的变形规律及破坏机理。缓倾岩层隧道开挖破坏范围主要集中在拱顶范围内,当岩层厚度发生变化时,边墙部位增幅较小,但顶板塑性区范围增加较大,塑性区深度约为边墙部位2～3倍。不同工况条件下,拱顶沉降均远大于水平收敛变形,且由于岩层之间粘结力较小,顶板岩层出现明显的离层现象。基于变形特征和破坏机理分析,提出了控制缓倾层状岩体隧道大变形及塌方的控制技术措施,可为类似条件下隧道设计与施工参考。
Based on the structural characteristics of horizontal layered surrounding rock, the deformation law and failure mechanism of tunnel excavation in layered surrounding rock are analyzed. The range of tunnel excavation damage is mainly concentrated in the vault range. When the rock thickness changes, the increase of the wall area is small, but the plastic zone of the roof increases greatly, and the plastic zone depth is about 2 ~ 3 Times Under different working conditions, the vault settlement is far greater than the horizontal convergence deformation, and due to the small cohesion between the rock layers, the roof strata appear obvious delamination phenomenon. Based on the analysis of deformation characteristics and failure mechanism, the control measures for controlling the large deformation and collapse of the gently inclined layered rock tunnel are proposed, which can be used as reference for tunnel design and construction under similar conditions.