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为分析单洞四车道特大断面公路隧道位移性状参数敏感性,以正交试验设计为基础,设计了物理力学参数变化对位移的影响程度进行研究的数值试验方案。基于二维平面应变弹塑性有限元方法,对Ⅴ级围岩双侧壁导坑法四车道隧道施工过程进行了多工况数值模拟,得出了围岩参数对隧道位移性状的敏感性程度,可为大断面隧道结构计算提供依据。
In order to analyze the parameter sensitivity of the displacement characteristics of a four-lane single-lane highway tunnel with large section, a numerical experiment scheme based on the orthogonal experimental design is designed to study the influence of the change of the physical and mechanical parameters on the displacement. Based on the two-dimensional plane-strain elastoplastic finite element method, the construction process of four-lane tunnel with V-grade surrounding rock by double-wall guide method was simulated and the sensitivity of surrounding rock parameters to the displacement characteristics was obtained. It can provide the basis for the calculation of large section tunnel structure.