基于有限元等效应力法的高拱坝封拱温度场研究

针对碾压混凝土高拱坝,采用有限元等效应力法计算分析不同封拱温度场的坝体等效应力,研究封拱温度场对坝体应力的影响,进而改进拱坝封拱温度场,确定合理的封拱方案。研究结果表明封拱温度场对高拱坝的等效应力影响显著,设计阶段应对封拱温度场进行专门研究,通过降低封拱时平均温度和增大封拱时坝体等效温差的方法对封拱温度场进行优选,最终达到改善坝体应力的效果。研究成果可以为碾压混凝土高拱坝封拱温度场的设计提供参考。

Analysis of joint closure temperature of high arch dam based on finite element equivalent stress method

A finite element equivalent stress method for calculation of the stress in RCC high arch dams with different joint closure temperature fields is presented, focusing on the effect of these fields on dam body stress to improve the fields and determine reasonable arch sealing solutions. The results show that this effect is significant and a special study on joint closure temperature in design phase is needed. And the dam stress could be improved effectively through optimization of the temperature field by reducing the average temperature of the dam at its arch sealing stage and increasing its equivalent temperature difference at this stage. This work would provide reference for the design of joint closure temperature in RCC high arch dams.