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本文结合具体工程,运用有限差分法计算软件FLAC建立了隧道计算模型,采用非线性弹塑性方法及Mohr-Coulomb屈服准则,对软弱围岩偏压连拱隧道的开挖施工方案进行了数值仿真研究,得到了隧道断面各个开挖阶段围岩、地表以及隧道初衬的应力、应变变化规律,从而达到验证支护条件和开挖方案合理性的目的,同时研究结果可以为软岩偏压条件下的隧道设计、施工提供有意义的参考。
In this paper, the calculation model of tunnel is established by using finite difference method software FLAC, and the nonlinear elastic-plastic method and Mohr-Coulomb yield criterion are used to simulate the excavation scheme of the soft surrounding rock biased multi-arch tunnel , The stress and strain changes of the surrounding rock, ground surface and tunnel lining in each excavation stage of the tunnel section are obtained so as to verify the support conditions and rationality of the excavation scheme. Meanwhile, the results of the study can be obtained under soft rock bias conditions The tunnel design, construction provides a meaningful reference.