基于精细有限元的大体积砼水管冷却效果研究

Study on Pipe Cooling Effect of Mass Concrete Based on Fine FEM

基于精细有限元方法,结合实际工程的局部坝段模型,仿真分析了不同冷却方式对施工期水管的冷却效果,阐述了冷却过程中水管周围的混凝土温度场和应力场在时间及空间上的分布状态和变化规律,量化了水管附加温度应力。结果表明,对于施工时仓面较大的水工混凝土结构,应尽量采用通仓同步冷却来控制混凝土内部温度,避免在同一浇筑块中由于冷却方式各异而导致温度裂缝出现。

Combined with a local dam section model, the paper simulates the eltect ot pipe cooling m construcnon pe- riod by using the different cooling measures based on fine finite element method. It analyzes the distribution and variation law of concrete temperature and stress field around pipes during the cooling process. And additional thermal stress of pipe cooling is quantized. The results show that the inner temperature of concrete should be controlled by synchronous cooling of long block so as not to yield temperature cracks due to different cooling measurement in the same pouring block.