考虑太阳热辐射的梯形渠道温度场动态数值模拟和衬砌冻胀分析

Numerical Simulation of Trapezoidal Channel Temperature Field and Lining Frost Heave Analysis Considering Solar Thermal Radiation

针对因缺乏渠道表面实测温度而难以准确模拟渠道温度场的问题,考虑太阳热辐射对渠道阴坡、阳坡和底板温度的影响,建立渠道表面增温计算模型,采用有限元软件ABAQUS,对经历三次降温情况下渠道的温度场变化过程进行数值模拟并分析渠道衬砌冻胀情况。结果表明,在太阳热辐射影响下渠道阴坡冻深显著大于阳坡和底板冻深,计算冻深和衬砌破坏规律也与实际情况吻合较好,在降温过程中阴坡的混凝土衬砌相较于阳坡和底板更容易发生冻胀破坏,按照多年最大冻深利用规范计算时也有相同规律,研究成果可为渠道混凝土衬砌温控防裂设计提供新思路。

Due to the lack of measured temperature on the channel surface,it is difficult to accurately simulate the channel temperature field.Considering the effect of solar thermal radiation on the temperature of the shady slope,sunny slope and bottom slab of the channel,a calculation model of channel surface temperature increase was established.The finite element software ABAQUS was used to simulate the temperature field change process of the channel and analyze the frost heave of the channel lining under the condition of three times of cooling.The results show that under the influence of solar thermal radiation,the freezing depth of the shady slope of the channel is significantly greater than that of the sunny slope and the bottom slab,the calculated freezing depth and the damage law of the lining are also in good agreement with the actual situation.During the cooling process,the concrete lining of the shady slope is more prone to frost damage than that of the sunny slope and the bottom slab,the same rule applies when calculated according to the multi-year maximum freeze depth utilization specification.The research results can provide new ideas for the temperature control and crack prevention design of channel concrete lining.