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本文运用大型通用计算软件ANSYS对浅埋近距离双线软土隧道施工过程进行了二维非线性粘弹塑性有限元分析,在分析中采用了土的粘弹塑性本构关系,引入土的蠕变方程,充分考虑了土体变形的时间效应。同时采用广义虚拟支撑力的方法,考虑开挖面的空间效应,研究了双洞同方向其中一洞超前掘进隧道施工时围岩主应力、地表沉降、洞周位移、塑性区发展及支护结构内力随时间的变化规律。得出一些有益的结论,为今后隧道施工提供了理论依据。
In this paper, a two-dimensional nonlinear visco-elasto-plastic finite element analysis of the shallow double-line shallow soft soil tunnel construction process is carried out by using the large-scale general calculation software ANSYS. The viscoelasto-plastic constitutive relation of soil is adopted in the analysis, Variable equation, fully considering the time effect of soil deformation. At the same time, by adopting the method of generalized virtual support force and considering the space effect of excavation face, the main stress of surrounding rock, surface settlement, displacement of surrounding rock, development of plastic zone and support structure during construction of one tunnel with double holes in the same direction are studied. Internal force changes with time. Draw some useful conclusions and provide a theoretical basis for the future tunnel construction.