假定土壤对管道的纵向摩阻力服从双线性规律,对端部有弯头、伸缩式补偿器或支墩的埋地管段建立了含有节理或刚臂的非线性复合单元模型,考虑到扁平效应及内压对弯头柔度的影响,编制了平面埋地热力管网热胀力通用计算程序。给出了算例,得到了令人满意的结果。 Assuming that the longitudinal friction resistance of the soil obeys the bilinear law, a nonlinear compound element model with joints or rigid arms is established for the buried pipe sections with elbows, telescopic compensators, or buttresses at the ends, taking into account the flattening effect. And the influence of internal pressure on the flexibility of the elbow, a general calculation program for the thermal expansion force of the surface buried heat pipe network was compiled. An example is given and satisfactory results are obtained.