锦屏一级高拱坝坝基加固效果分析

锦屏一级高拱坝复杂的坝址地质条件使基础加固处理工程巨大，主要包括左岸混凝土垫座置换、左岸传力硐、左岸f5、f8、煌斑岩脉混凝土网格置换，右岸f13、f14断层混凝土网格置换。采用非线性有限元分析方法，对坝基加固后锦屏一级水电站坝体在多种工况下的的应力、变形特性进行了计算分析，给出了坝体蓄水期的应力、位移分布及超载、降强对位移的影响结果，并与无垫座方案的相关数据进行对比，表明加固后坝体蓄水期总体变形规律明显改善，坝踵拉应力减小，坝体与坝基安全储备能力提高，满足设计要求；在应力、变形方面肯定了大规模加固措施的必要性。

Analysis of stress and deformation of Jinping I High Arch Dam after foundation reinforcement

The complex geological conditions in the site of Jinping I Arch Dam made its reinforcement measures a huge project ,which mainly includes the concrete seating replacement ,shearing resistant adit, with the fault f13, f14 in the right bank and fault f5 、f8 and lamprophyre veins in the left bank treated with concrete lattice replacement. By employing nonlinear finite element analysis, this article gives computing results and detailed discusses on the dam stress and deformation characteristics of Jinping I Arch Dam under several operation conditions after the dam foundation reinforced. The dam stress distribution and deformation are also discussed by way of strength reserve method and the water gravity overload method. The results show that during the inpounding period, the overall characteristics of deformation and stress distribution of the dam have been significantly improved; the tensile stresses in the heel of dam are decreased after reinforcement; and the dam has enough global stability storage to completely meet the design requirements. Thus the necessity of the concrete seating replacement is afirmed.