南水北调中线大型渡槽运行期温度场的计算

Calculation of temperature field of large-scale concrete aqueduct during operation period

较全面分析了运行期渡槽温度边界条件的各种影响因素,并给出各因素较为精确的计算公式.利用瞬态有限元方法给出了渡槽运行期瞬态温度场的计算方法,并通过对实验水槽的计算结果与实测数据对比,说明所提出的边界条件计算公式和温度场计算方法是正确可靠的.还对南水北调洺河渡槽温度场进行了计算,并得到了一些有益的结论.

At first, influential factors of temperature boundary conditions have been comprehensively analyzed; and formulas for calculating influential factors have been given accurately. Then based on the transient analysis type of FEM, a method of calculating transient temperature field of concrete aqueducts during operation period has been given. The computing results of experimental concrete trough are compared with the experimental ones; and it is shown that the formulas and method proposed are accurate. Finally, some useful conclusions are drawn by calculating the temperature field of Minghe River Aqueduct for the South-to-North Water Transfer Project. The research results can offer reference for the construction of aqueducts for the South-to-North Water Transfer Project.