Abstract: Based on nonlinear finite element analysis, 3-D elastic-plastic numerical simulation of Jinping Ⅰ high arch dam is developed. By multi-grid method, the stress result of FEM could transfer on any sliding surface (plane or surface), and the safety factors of sliding blocks could be obtained. The elastic-plastic calculation results indicate that the minimal safety factor of the left abutment under basic condition is 4.88 (larger than 3.5), which appears on the 1 740 m elevation under temperature drop condition, and the minimal safety factor of the right abutment under basic condition is 3.41 (less than 3.5), appearing on the 1 710 m elevation under temperature rise condition, which means it is necessary to take reinforcement measures for right abutment.

Key words: multi-grid method, Jinping Ⅰ high arch dam, rigid body limit equilibrium method

摘要： 对锦屏一级拱坝右岸坝肩采用非线性有限元分析方法，进行三维弹塑性数值模拟，通过使用多重网格法，在任意滑动面上（平面或曲面）对有限元应力计算结果进行转换，计算得到滑块体的安全系数。弹塑性计算结果表明，基本工况条件下，左岸坝肩的最小安全系数为4.88（大于3.5），出现在温降工况下1 740 m高程处；右岸坝肩的最小安全系数为3.41（小于3.5），出现在温升工况下1 710 m高程处。该结果表明对右岸坝肩采取一定的加固措施是有必要的。

关键词: 多重网格法, 锦屏一级高拱坝, 刚体极限平衡方法