【摘要】 复杂地基上重力坝的抗滑稳定问题一直是设计人员关注的重要问题。针对马马崖一级水电站的复杂地质条件,分析了重力坝河床坝段群潜在的滑移模式,建立了坝体和坝基的三维有限元模型,利用有限元应力代数和法和刚体极限平衡法对该溢流坝段的抗滑稳定进行了分析,研究了左岸非溢流坝段与河床溢流坝段之间接触面黏聚力对大坝抗滑稳定的影响,同时分析了上下游岩体对坝段抗滑稳定的影响。结果表明:采用应力代数和法计算出的抗滑稳定系数要比刚体极限平衡法得到的抗滑稳定系数小;坝段之间横缝灌浆的黏聚力对河床坝段群的抗滑稳定具有重要的影响,考虑横缝灌浆的黏聚力作用后河床坝段群的抗滑稳定性能满足规范要求。计算结果为马马崖一级水电站大坝的抗滑稳定处理措施设计提供了参考。更多还原

【Abstract】 Based on the geologic conditions and basic characteristics,a three dimensional FEM finite element model of Mamaya project was established. Based on three dimensional rigid body limit equilibrium theory and strip dividing method,the anti-sliding stability of the overflow section was analyzed. The influence of the cohesive force between dam sections was researched. The effects of foundation rock in upstream and downstream on the dam anti-sliding stability was also considered. The results show that the anti-sliding stability coefficient computed by strip dividing method is smaller than that calculated by three dimensional rigid body limit equilibrium theory. The cohesive force between dam sections is an important factor for increasing the stability of overflow section. When the cohesive force of the grout mixes between dam sections is considered,the anti-sliding stability factor of the overflow section meets the specification requirements. The research conclusion applies references for designing the anti-sliding measures of the overflow section.更多还原