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首先给出冻土的弹粘塑性本构关系方程 ,然后以大坂山隧道为例 ,模拟隧道的开挖和衬砌过程并考虑渗流体积力的影响 ,给出了隧道刚修好时隧道衬砌和围岩的初应力和位移。在此基础上模拟冻融循环过程 ,给出了考虑围岩的冻胀后 ,隧道刚好使用 1年和 5年时隧道衬砌和围岩的应力和位移。最后对寒区隧道的地震响应进行弹粘塑性有限元分析。算例表明 ,寒区隧道衬砌和围岩的初应力和位移对其地震响应有很大的影响 ,在寒区隧道设计中应该充分考虑这些因素。
Firstly, the elasto-visco-plastic constitutive equation of permafrost is given. Then, taking the Osaka mountain tunnel as an example, the tunnel excavation and lining process are simulated and the influence of seepage volume force is considered. The tunnel lining and surrounding rock Initial stress and displacement. On this basis, the freezing and thawing cycles are simulated, and the stress and displacement of tunnel lining and surrounding rock are given after considering the frost heaving of the surrounding rock just one year and five years. Finally, the elasto-visco-plastic finite element analysis of the seismic response of the tunnel in cold region was carried out. The results show that the initial stress and displacement of tunnel lining and surrounding rock in cold area have a great influence on the seismic response, and these factors should be fully considered in the design of tunnel in cold area.