关键词: 稳定性分析, 导流洞堵头, 永临结合堵头, 三维有限元, 猴子岩水电站

Abstract: Rapid closure of diversion tunnel for Houziyan Hydropower Station adopts "permanent-temporary combined plug" scheme, plugging structures and conditions have new characteristics. It is of great significance to do systematic research on the stability of the diversion tunnel plug. Firstly, the limit state design method of partial coefficient was used to calculate the length of the diversion tunnel plug. Then, the stability of the plug was calculated and checked by the safety factor method of anti-sliding stability. Finally, the three-dimensional finite element method was used to analyze the stability and the stress characteristics of the plug structure. The results showed that the design scheme of the diversion tunnel plug could meet the requirements of structural stability, and provided theoretical basis for the smooth closing of Houziyan Hydropower Station to achieve the goal of early impounding and power generation.

Key words: stability analysis, diversion tunnel plug, permanent-temporary combined plug, three-dimensional finite element method, Houziyan Hydropower Station