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为了研究黄土连拱隧道动态施工时围岩的损伤情况和损伤分布规律,在室内试验的基础上推导了Q2黄土的弹塑性损伤本构模型,并基于FLAC3D平台编制了自定义本构模型,提出了损伤度概念并编制了损伤度后处理模块。以国内首条高速公路黄土连拱隧道-离石隧道为依托工程,对两种开挖方案施工时围岩损伤情况进行数值分析。研究表明,该成果可以较好地掌握隧道每一开挖步后围岩损伤度的分布情况和损伤区的演化规律,为施工方案优化选择提供依据。该研究成果为地下工程支护参数优化和方案的选择开辟了一个新的方向。
In order to study the damage and distribution of surrounding rock during the dynamic construction of the double-arch tunnel in the loess, the elasto-plastic damage constitutive model of Q2 loess was deduced based on the laboratory tests. A self-defined constitutive model was developed based on the FLAC3D platform. The concept of damage degree and the preparation of the degree of injury after-treatment module. Based on the first loess double-arch tunnel in China-Lishi tunnel, the numerical analysis of surrounding rock damage during the construction of the two excavation schemes is carried out. The results show that the results can well grasp the distribution of damage degree of surrounding rock and the evolution of damaged area after each excavation step, and provide the basis for the optimization of construction options. The research results have opened up a new direction for the optimization of underground engineering support parameters and the selection of schemes.