基于温度应力仿真的三河口碾压混凝土拱坝分缝设计研究

Research on Jointing Design of RCC Arch Dam Based on Temperature Stress Simulation

应用有限元分析软件ANSYS,考虑三河口碾压混凝土拱坝全过程瞬态温度荷载,对采用“4条横缝+4条诱导缝”和“5条横缝+4条诱导缝”的坝体分缝设计方案进行温控仿真分析,并在初期蓄水阶段对坝体接缝实施变形监测分析。结果表明:采取控制浇筑温度和通水冷却的双重温控措施,采用“5条横缝+4条诱导缝”的分缝形式,可确保坝体在温度荷载下的运行安全和蓄水期的正常工作性态。温度控制和裂缝预防研究成果可为类似工程的结构设计和现场施工提供参考。

In order to reduce the temperature load of roller compacted concrete arch dam and control the disordered cracks caused by temperature shrinkage,it is very important to choose a reasonable scheme of dam structure joint.By using the finite element analysis software ANSYS and considering the whole process transient temperature load from the construction period to the operation period,the temperature control simulation analysis of the joint design scheme of Sanhekou RCC arch dam with“4 transverse joints&4 induced joints”and“5 transverse joints+4 induced joints”is carried out,and the deformation monitoring analysis of the dam joints is carried out in the initial impoundment stage.The results show that taking the double temperature control measures of controlling the concrete pouring temperature and water cooling,and using the joint form of“5 transverse joints+4 induced joints”can ensure the operation safety of the dam body under the temperature load and the normal working behavior during the impoundment period.The research results can provide reference for temperature control and crack prevention of similar RCC arch dam projects.