摘要
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。
In the view of a new type tunnel with permeable ribbed arch beam, the destruction modes of the surrounding rock under different lithological character conditions by using the simplified two-dimensional numerical model are studied. The analysis results indicate that whether homogeneous rock or heterogeneous rock, the damage regions expand from medial arch foot to the vault slope, and have a sliding surface with a certain angle between the horizon. The destruction mode is the slip of the rock in the vault slope, but the destruction mode isn＇t obvious when the surrounding rock strength is very strong. The monitored displacement results indicate that the actual tunnel deformation patterns is consistent with the numerical results in the deep rock conditions. The research results provide the basis for the reinforcement means and the depth of the permeable ribbed arch beam tunnels, and have a guiding significance in the optimization design of tunnel support.
出处
《公路》
北大核心
2009年第2期215-219,共5页
Highway
关键词
通透肋式拱梁隧道
围岩
破坏模式
permeable tunnel with ribbed arch beam
surrounding rock
destruction mode
