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为分析大体积混凝土在导流洞封堵过程中安全性,依托某电站工程实例,从热力学理论出发进行瞬态分析,通过理论计算相关参数,运用ANSYS软件建立三维有限元模型,对未采取温控的临时堵头和采用温控永久堵头浇筑全过程的温度场及应力场进行仿真分析。结果表明,通水冷却温控措施使温降速率明显增大,混凝土温度极值降低。入仓温度降低有利于堵头浇筑最高温度和最大温升的降低,同时有利于结构主应力量值的减小,且对较长的永久堵头影响更明显。通过APDL语言二次开发的程序,得到全过程的应力极值及分布,可针对性采取工程措施降低应力水平。结果可为类似工程提供参考依据。
In order to analyze the safety of massive concrete in the process of blockage of diversion tunnel and relying on the engineering example of a power station, transient analysis is carried out based on the theory of thermodynamics. The relevant parameters are calculated theoretically and the three-dimensional finite element model is established by ANSYS software. Control the temporary plug and the use of temperature control permanent plugging the whole process of temperature and stress field simulation analysis. The results show that the water temperature control measures make the temperature drop rate obviously increase, and the extreme value of concrete temperature decrease. Lower warehousing temperature is conducive to plugging the maximum temperature and the maximum temperature drop, while helping to reduce the amount of the main structural stress, and the impact of longer permanent plug more obvious. Through APDL language secondary development program, the whole process of stress extremes and distribution, engineering measures can be targeted to reduce the stress level. The results can provide a reference for similar projects.