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

作　　者：陈武[1] 吴亚平[2] 闫聚考[3] 张戎令[2] 

机构地区：[1]中国科学院寒区旱区环境与工程研究所冻土工程国家重点实验室,兰州730000 [2]兰州交通大学土木工程学院,兰州730000 [3]同济大学,上海200092

出　　处：《路基工程》2012年第5期9-12,共4页Subgrade Engineering

基　　金：国家自然科学基金项目(41171060;41101068);中国科学院知识创新工程重要方向项目(KZCX2-EW-QN301);冻土工程国家重点实验室自主项目(SKLFSE-ZY-03;SKLFSE-ZY-02-08)

摘　　要：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.

关 键 词：寒区冻土 路基涵洞 冻胀变形 数值分析 

分 类 号：U416.148[交通运输工程—道路与铁道工程]