【摘要】 考虑了冻胀敏感性土和冻胀非敏感性土在交界面两边的冻胀差异性,及穿越两种土壤交界面的输油、输气管道的内禀轴向力(可能源自温度应力、交界面处的水平冻胀效应,以及管道安装时产生的初应力等)的联合作用,建立了可用于计算管道的横向位移(挠度)、弯矩和剪力等分布状态的数学模型,并进行了解析求解.对该模型基于算例的数值分析表明,管道中存在一定程度的轴向拉力有利于冻胀环境下管道的安全运营,而存在一定程度的轴向压力不利于管道在冻胀环境下的安全运营.暖季埋设的管道在冷季来临时,温度应力表现为轴向拉应力.忽略其他原因产生的轴向压力,管道会因温度拉应力的存在而变得更加安全稳定.更多还原

【Abstract】 By considering the differential frost heave displacements of two soils(frost-susceptible and non-frost-susceptible soils) and the existed axial force(possibly arising from thermal stress, horizontal frost-heave near the interface of two soils and initial stress caused by pipe installation) in a buried pipeline that trailed through the interface of two soils from one side to another, a theoretic model for calculating the distributions of lateral displacement(deflection), bending moment and shear force was developed;accordingly, the analytic solution of this model was derived. Based on one example, the numerical analysis of the model’s analytic solution showed that the presence of an axial tensile force was advantageous to the safety of a pipeline while the presence of an axial compressive force was detrimental to it.When a cold season came, the axial tensile force of a certain degree in a pipeline laid in a warm season could be naturally produced. If the axial compressive force in a pipeline, due to other reasons, was small and could thus be ignored, the pipeline with a higher tensile strength would become more stable under the influence of an axial tensile force.更多还原