猴子岩水电站导流洞堵头稳定性分析

Analysis on stability of diversion tunnel plug of Houziyan Hydropower Station

猴子岩水电站导流洞快速封堵采用"永临结合堵头方案",堵头结构和封堵工况独具特性,对导流洞堵头稳定性进行系统研究有重要意义。首先,采用分项系数极限状态设计法计算堵头长度;然后,采用抗滑稳定安全系数法对堵头稳定性进行计算复核;最后,采用三维有限元法对堵头结构的极限抗滑稳定性及应力应变特性进行深入分析。计算结果表明,导流洞堵头设计方案满足结构稳定性要求,可为猴子岩水电站顺利下闸封堵以实现提前蓄水发电目标提供理论依据。

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.