论文部分内容阅读
针对一种新型隧道结构型式——通透式拱梁隧道,采用二维数值模型,对不同岩性条件下隧道围岩的破坏模式进行了探讨,分析结果表明:无论是均质围岩还是非均质围岩,围岩破坏区域由内侧拱脚向拱顶边坡扩展,并存在与水平线呈一定角度的的滑动面,破坏模式为拱顶山坡岩体的块体滑移,但当隧道围岩强度较高时,上述破坏模式不明显;深层岩体位移监测结果表明隧道围岩实际变形形态与数值计算结果基本一致。研究成果为通透式拱梁隧道加固手段和加固深度提供了依据,对支护设计的优化具有指导意义。
Aiming at a new type of tunnel structure, which is a through-beam tunnel, two-dimensional numerical model is used to investigate the failure modes of surrounding rock under different lithology conditions. The analysis results show that, Homogeneous wall rock and surrounding rock failure area extend from the inner arch to the vault slope, and there is a sliding surface at an angle with the horizontal line. The failure mode is the block slip of the rock mass on the vault hillside, The above failure mode is not obvious when the rock strength is high. The monitoring results of displacement of deep rock mass show that the actual deformation of tunnel surrounding rock is basically consistent with the numerical calculation. The research results provide the basis for the strengthening method and the depth of reinforcement for the tunnel of tunnel with arch-type transverses, which is of guiding significance for the optimization of the support design.