大截面矩形渡槽施工期间温度场特性的试验研究

Experimental Research on Temperature Field Characteristics of Large Cross-section Rectangle Aqueduct During Construction

通过模拟真实环境下缩尺寸渡槽模型的精细化施工及传感器的优化埋置,研究了大截面矩形渡槽底板与侧墙的温度分布场规律。结果表明,第一批浇筑模型底板有四个温度变化阶段,且温度明显呈非线性分布,空气的流通状况及底模是否拆除是影响温度分布的关键因素,而模型侧墙早期沿壁厚方向温度梯度不大,原因在于侧墙厚度不大且木模板具有一定的保温作用。通过此研究,明确了渡槽模型温度场的分布特性,可以为分析渡槽的温度应力及开裂机理提供试验和理论基础。

By simulating refinement construction of shrinkage size aqueduct model and optimization embedment of sensors under real environment, the temperature distribution field laws of large cross-section rectangle aqueduct base plate and side wall are studied. The results indicate that the first batch of casting model base plate has four temperature phases, the temperature distribution is nonlinear, and the air circulation situation and whether or not to dismantle the base plate are the key influence factors on the temperature distribution. Temperature gradient of model side wall along the thickness direction at early age isn＇t big, which is because the side wall isn＇t thick and wood formwork has a certain heat preservation effect. Through this research, the temperature field distribution characteristics of aqueduct model are cleared, and it can provide the experimental and theoretical basis for analyzing the temperature stress and crack mechanism of the aqueduct.