寒区路基涵洞在冻胀变形作用下的受力特性研究

Study on Mechanical Characteristics of Subgrade Culvert in Cold Region under Action of Frost-heaving Deformation

应用ANSYS有限元计算软件对寒区路基涵洞进行了模拟计算,采用不同的工况模拟寒区路基涵洞的冻胀影响,对涵洞-冻土整体数值分析模型进行了非线性有限元分析。对路基涵洞在不同冻胀率、有无垫层、不同垫层厚度下的位移及拉应力关系进行分析。揭示可能导致路基涵洞结构发生破坏的主要因素如冻胀率及冻胀深度等的设计限制值,给出了路基涵洞结构在不同冻胀变形下垫层厚度的安全限制值。

With ANSYS finite element analysis software, simulation is carried out against subgrade culvert in cold region to the extent that the frost-heaving effect on such culverts in different cases is simulated and nonlinear finite element analysis is conducted against the integrated culvert-frozen soil numerical analysis model; and then the relationship between displacement and tensile stress of the subgrade culvert under different frost-heaving rates, cushion or no cushion, or different thickness values of the cushion is analyzed. Thus, the design limits of the main factors, which may cause structural damage on the subgrade culvert, such as rate and depth of frost-heaving, are disclosed; and the safety limits of the cushion thickness for the subgrade culvert structure under different rates of frost-heaving.