基于现场试验得到的混凝土物理及热特性参数,建立有限元仿真模型,获得理论水化热温度-应力场.结合有限元数值模拟及现场实测,得到了混凝土水化热发展的时程曲线及一般规律,并研究了混凝土内部温度梯度沿承台厚度方向和平面长度方向随龄期增长的变化情况,以及承台边缘部位混凝土的热应力分布规律.数值分析和现场实测结果验证了预先制定的温控措施的适用性,对于相近结构的设计、施工以及提高工程的可靠性和耐久性具有参考价值.%Based on the physical and thermodynamic parameters acquired by experiment, FEM. calculation model is established and the theoretical hydration heat -thermal stress field was obtained. With the theoretical simulation and the monitoring results, the regular law and time - history curve of hydration heat was obtained, and the variation of inner temperature gradient along the height direction as well as the longitudinal direction with the concrete age were studied. Besides, the distribution law of thermal stress in pile cap' s edge area was analyzed.The feasibility of temperature control measures was verified by numerical analysis and observed data, and the results can improve structural reliability and provide reference for design and engineering of the similar projects.
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