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陡倾岩层隧道由于层状结构的存在,在开挖过程中,围岩的破坏机理与方式、围岩与结构的变形、受力等特征明显不同于其它岩体隧道。本文在陡倾岩层隧道开挖破坏机理探讨的基础上,通过三维数值模拟,对不同陡倾角条件下围岩与结构的变形、受力特征进行了计算,分析了隧道开挖力学特性与倾角的关系,提出了陡倾岩层隧道设计施工建议。计算结果表明:倾角越大,隧道发生顺层滑移破坏的概率越大,地表沉降、拱顶位移、围岩主应力随倾角的增大而增大,但拱脚位移、围岩剪应力、喷射混凝土内力与倾角并非一致性关系。
Due to the presence of layered structures, the steeply-rock tunnels are characterized by the failure mechanism and mode of surrounding rock and the deformation and stress of surrounding rock during excavation, which are obviously different from those of other rock tunnels. Based on the discussion of the mechanism of excavation and destruction of steep-rock tunnel, the deformation and stress characteristics of surrounding rock and structure under different steep inclination conditions are calculated by three-dimensional numerical simulation. The effects of tunnel excavation mechanics and inclination Relationship, put forward the design and construction of steep rock tunnel construction recommendations. The calculation results show that the larger the inclination angle is, the greater the probability of tunnel slip damage is. The settlement of ground surface, the displacement of dome and the main stress of surrounding rock increase with the increase of dip angle. However, the displacement of arch foot, Sprayed concrete internal force and inclination are not consistent.