碾压混凝土重力坝安全度评价方法研究

光照碾压混凝土坝是目前世界上最高的碾压混凝土重力坝之一，坝高库大，其安全稳定性是施工期和运行期中至关重要的技术问题。运用有限单元法，对光照碾压混凝土重力坝施工期和运行期的温度场、渗流场、应力应变场等进行仿真分析，采用超载法和强度折减法相结合的方法模拟坝体（坝基）系统的渐进破坏过程和可能的失稳模式，并根据特征点位移突变、屈服区贯通等方法判断大坝的整体安全度，同时对坝基浅层面进行抗滑稳定计算。研究结果表明，光照碾压混凝土重力坝的整体安全度大于3.0，且坝基浅层面等薄弱部位的安全系数大于2.0，满足工程稳定的需要。

Study on stability evaluation method for RCC gravity dam

The dam of Guangzhao Hydropower Station is one of the highest RCC gravity dams in the world with large reservoir capacity,the dam safety and stability is one of key issues in the construction and operation period.By finite element method,the temperature filed,seepage field,stress-strain field of the dam are simulated and analyzed;by overloading and strength reduction methods,the progressive damage process and possible stability loss mode of the dam body and foundation are simulated and the dam integral safety degree is identified according to sudden change of the displacement of feature points,yield zone penetrating condition,and in the meantime,the anti-sliding analysis for the shallow stratum of the dam foundation is conducted.The study result shows the general safety degree of the RCC gravity dam is higher than 3.0,and the safety degree of weak zones such as the shallow stratum of dam foundation is higher than 2.0,which can meet the project stability requirement.