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以武罐高速公路韩家磨#3隧道浅埋偏压洞口段为研究对象,提出了基于“隧道–边坡体系”概念的变形机理分析方法。应用该方法对体系的工程地质环境进行了系统调查,结合洞口段施工过程中的变形特征和监控量测成果,对体系的结构类型和变形机制进行细致研究。在此基础上采用三维快速拉格朗日差分法(FLAC3D),对隧道施工开挖及支护过程进行了模拟。通过对开挖支护后隧道围岩和边坡的应力场、位移场及塑性区特征的分析,得出了一些建设性的结论,对工程的施工具有指导意义。
Taking the shallowly buried bias section of Hanjiao Mill tunnel # 3 in Wu-jin Expressway as the research object, a deformation mechanism analysis method based on the concept of “Tunnel-Slope System” was proposed. This method was applied to systematically investigate the engineering geological environment of the system. Based on the deformation characteristics during the construction of the tunnel mouth section and the monitoring and measurement results, the structure type and deformation mechanism of the system were studied in detail. On this basis, a three-dimensional fast Lagrangian difference method (FLAC3D) is used to simulate the tunnel excavation and support. Through the analysis of stress field, displacement field and plastic zone characteristics of tunnel surrounding rock and slope after excavation and support, some constructive conclusions are obtained, which have guiding significance for the construction of the project.