考虑双层异质水管的大体积混凝土施工期温度场仿真

Simulation of the temperature field in mass concrete with double layers of cooling pipes during construction

针对当前高拱坝及特高拱坝施工过程出现的单仓混凝土中铺设2层不同材料水管的现象,该文基于考虑水管冷却的等效热传导方程,推导出铺设双层异质水管情况下混凝土等效导温系数的表达形式,并提出了多层水管平均降温效果的简化求解方法,使得不同材质水管铺设方案的计算可以在同一套有限元网格上展开。应用本文所提出方法对国内某大型拱坝工程施工期的仿真计算结果与实际测量温峰相差在5%以下,温度发展历程一致,验证了该方法的合理性。

Two layers of cooling pipes made of different materials are embedded in each cabin in some large arch dam construction projects.The principle of the equivalent of conduction of heat was used to develop an expression for the equivalent coefficient of the thermal diffusivity of concrete,and a simplified computation method for numerical calculations was also proposed.Different cooling-pipe layouts can then be analyzed on the same finite element mesh.The concrete temperature distribution of one section of a large arch dam can then be calculated by this method with the result being very consistent with actual temperature measurements with peak values differing by less than 5%.