Abstract: A three-dimensional finite element model for the spillway section on the riverbed is established to analyze the actual safety state of the RCC gravity dam of Fenhe secondary reservoir after emergency reinforcement. COMSOL Multiphysics is used for multi-field coupling analysis. The results show that the overall law of seepage field, displacement field and stress field is rational. Most areas are safe, and only a few areas have tensile stress. Research shows that COMSOL Multiphysics can be applied to multi-field coupling analysis of RCC gravity dam and the reinforcement has achieved the anticipated effects. It is suggested to strengthen the safety monitoring.

Key words: multi-field coupling analysis, RCC gravity dam, COMSOL Multiphysics, three-dimensional finite element method, emergency reinforcement

摘要： 为分析汾河二库RCC重力坝应急除险加固后实际安全性态，建立典型工况下河床溢流坝段的三维有限元模型，采用COMSOL Multiphysics进行多场耦合分析。计算结果显示，渗流场、位移场和应力场总体规律正常，大部分区域在安全范围内，只有极少区域出现拉应力。研究表明，COMSOL Multiphysics可进行RCC重力坝多场耦合分析，除险加固达到预期效果，建议加强安全监测。

关键词: 多场耦合分析, RCC重力坝, COMSOL Multiphysics, 三维有限元, 除险加固