复杂地质条件下公路连拱隧道开挖稳定分析

通过对金丽温高速公路土羊湾连拱隧道的复杂地质条件进行调查和分析，利用ANSYS软件模拟了隧道开挖及加固过程，分别详细分析了在不同开挖步中隧道区域围岩的变形场和应力场及其变化特征。分析结果表明由于中隔墙和衬砌的重力作用，加固后围岩的向上位移值减小而向下位移值增加；而加固后研究区域的Y向应力均减小，说明衬砌很好地起到了加固围岩的作用。

Stability Analysis of Doubled Arch Tunnels Excavation in Expressway under Complicated Geological Conditions

The complicated geological conditions of Yangwan doubled arch tunnel in Jinliwen expressway are investigated and analyzed in this paper. The excavation and consolidation of the tunnel are simulated by the software ANSYS. The deformation field and stress field of surrounding rock around the tunnel, as well as their variation characters, are analyzed respectively in detail during different excavation steps. The result of the research shows that the upward displacement of surrounding rock reduces and the downward displacement of surrounding rock increases after reinforcing the tunnel because of gravity action of the partition and lining. The result also shows that the Y - stress of research field reduces after the tunnel reinforcing, which shows that the surrounding rock is reinforced by the liner very well.