大体积混凝土沉管隧道温度场的数值仿真分析

通过对广州国际创新城金光东沉管隧道进行有限元分析,模拟得到了沉管大体积混凝土的最高温度及其出现的位置。将其与现场监测数据对比表明,基于Midas FEA对沉管大体积混凝土进行的有限元分析结果可靠。通过进一步对散热系数入模温度及环境温度进行参数化分析,发现沉管大体积混凝土温度与热交换系数呈负相关,与混凝土的入模温度和环境温度呈正相关。这表明,要保证混凝土的浇筑质量,必须严格控制混凝土的入模温度及养护条件,其中降低混凝土的入模温度效果最为显著。

Numerical Simulation Analysis of Temperature Field of Mass Concrete Immersed Tunnel

Through the finite element analysis of the Jinguangdong immersed tunnel of Guangzhou International Innovation City, the maximum temperature of the immersed mass concrete and its location are obtained. Comparing with the on-site monitoring data, it shows that the finite element analysis based on Midas FEA on the immersed mass concrete is reliable. Through further parametric analysis on heat dissipation coefficient placing to mold temperature and ambient temperature, it was found that the temperature of the immersed mass concrete was negatively correlated with the heat exchange coefficient; it was positively correlated with the concrete placing to mold temperature and ambient temperature. This indicates that to ensure the quality of concrete pouring, the concrete placing to mold temperature and curing conditions must be strictly controlled and the effect of reducing the concrete placing to mold temperature is most significant.