黄土公路隧道预支护施工技术研究

Study of Advanced Supporting Technology of Loess Highway Tunnels

针对目前黄土公路隧道设计与施工的现状以及存在的问题,结合在建古浪隧道实体工程,分析了小导管注浆超前支护施工技术的要点,利用ANSYS程序建立三维实体模型分析预支护技术对开挖围岩的稳定性影响及围岩和支护结构在施工过程中的受力变化情况.结果表明,超前支护可以提高围岩自稳自承的能力,减小围岩的收敛变形.

By analyzing the status quo and practical problems existing in the design and construction of loess highway tunnels,combined tightly with the establishment of Gu-Lang loess highway tunnel,the key construction technique of advanced supporting is studied.A three-dimensional solid model of ANSYS program is used to analyze the stability of surrounding rocks and the consecutive variations of the forces of the structures.Our conclusion is：the surrounding rocks can enhance the ability of stable self-supporting and reduce the convergence of rock deformation by advanced supporting.