Mass concrete structures are prone to suffer temperature destruction during construction and operation because of their own mechanical properties and the role of cement hydration; therefore, the law of temperature field and temperature stress changes is crucial. This paper is based on the heat conduction theory and contact friction element theory under general external load. The heat conduction matrix, node thermal load vector, equivalent stiffness-constraint matrix and equivalent load vector of the contact friction element are each added to the whole heat conduction matrix, thermal load vector and total stiffness matrix, and the total load vector according to the finite element integration rule to establish the thermal-stress calculation model of the contact friction element. Combined with the Qi River inverted siphon project, this paper analyzed the temperature field and temperature stress using the three-dimensional finite element method, considering the changes of concrete thermodynamic parameters with age and the outside air temperature and other conditions, and obtained the distribution and variation in temperature field and temperature stress during the construction of an inverted siphon. The research results are of great significance for temperature control and crack prevention of inverted siphon structures. The thermal-stress calculation model of the contact friction element overcomes the limitations that it is difficult to use the current contact surface model to perform the temperature field simulation and further improves the application of the contact friction element model in the simulation of the temperature field and the temperature stress of mass concrete.

大体积混凝土结构因其自身的机械性能和水泥水化作用而易于在施工和操作过程中遭受温度破坏。因此，温度场和温度应力变化规律至关重要。本文基于一般外部载荷下的热传导理论和接触摩擦元件理论。导热矩阵，节点热负荷矢量，接触摩擦元件的等效刚度约束矩阵和等效负荷矢量分别添加到整个导热矩阵，热负荷矢量和总刚度矩阵中，并根据建立有限元积分法则，建立接触摩擦元件的热应力计算模型。结合淇河倒虹吸工程，本文利用三维有限元法对温度场和温度应力进行了分析，考虑了混凝土热力学参数随年龄和外界气温等条件的变化，得出了混凝土温度场和温度应力的分布和变化。倒虹吸管的结构。研究结果对倒虹吸结构的温度控制和防裂具有重要意义。