仰拱一次性开挖长度对黄土连拱隧道稳定性影响研究

Effect of excavation length of inverted arch in one step on stability of multi-arch tunnels in loess

摘要: 为了研究合理的黄土连拱隧道仰拱一次性开挖长度,减少工程灾害和加快施工进度,先从力学机理上分析了仰拱一次性开挖长度对隧道稳定的影响。然后利用有限元方法模拟和自行设计的隧道试验系统进行模型试验,分析了不同的仰拱一次性开挖长度对地表沉降、洞周附加水平位移和中隔墙的受力影响。最后提出了最佳的黄土仰拱一次性开挖长度,并应用于黄土连拱隧道的施工。

Abstract: The reasonable excavation length of inverted arch in one step is an important parameter to the construction of multi-arch tunnels in loess,and it can reduce engineering accidents and accelerate tunnel construction.The effect of different excavation lengths of inverted arch in one step was analyzed by use of the finite element method and model tests.According to the final results of analysis,a reasonable excavation length of inverted arch in one step was put forward and applied to the construction of multi-arch tunnel in loess.