基于弹性补偿法的拱坝极限承载力分析方法

针对弹塑性分析方法所采用的破坏模拟方式有失客观性且现有的失稳判据过多受人为因素干扰的问题,结合混凝土拱坝的结构特点,提出了基于Mohr-Coulomb屈服准则的单元承载比计算方法,探讨了通过承载比均匀度与基准承载比调整单元弹性模量的策略;基于塑性极限分析方法,提出了基于弹性补偿法的拱坝极限承载力分析方法。工程实例分析结果表明,采用该方法分析拱坝的极限承载力是合理和有效的。

Analysis approach for ultimate bearing capacity of arch dams based on elastic compensation method

In view of the facts that the failure simulation method adopted in elasto-plastic analysis lacks objectivity to a certain degree, and the currently used instability criteria are seriously influenced by artificial factors, a calculation method for the element bearing ratio, considering the characteristics of concrete arch dams, is put forward based on the Mohr-Coulomb yield criterion, and the adjustment of the element elastic modulus by means of the uniformity of the bearing ratio and the base bearing ratio is discussed. Then, an ultimate bearing capacity analysis method of arch dams based on the elastic compensation method and plastic limit analysis method is put forward. Analysis of an engineering case shows that this method is reasonable and effective.