拉西瓦水电站导流洞堵头结构与稳定分析

Structure and Stability Analysis of Diversion Tunnel Plug for Laxiwa Hydropower Station

导流隧洞堵头的稳定性与大坝同等重要。在抗剪断理论的基础上,采用非线性有限元分析方法,对拉西瓦水电站导流隧洞堵头进行了三维有限元计算,并对堵头结构特征位置的应力、变形以及堵头整体的抗剪断安全系数等方面展开了细致深入的分析。结果表明:44m长度堵头部分可以满足初期封堵需要,65m长度可以满足后期水库蓄水封堵需要,分段封堵分期挡水方案是可行的。

The stability of the diversion tunnel plug is important as the dam. The diversion tunnel plug of LaXiWa hydropower station was analyzed by the method of 3-D finite element on the basis of shear resistance theory. And analysis were conducted based on the stress, deformation of plug, and shear resistance coefficient. It was shown that adopting 44m-long plug and 65m-long plug can meet the requirements both for initial stages and later stage respectively. Obviously the plugging by sections and by periods was feasible.