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三峡工程二期围堰塑性混凝土防渗墙的应力变形是衡量围堰安危的重要指标。由于该围堰的运用期为 5年 ,根据试验确定的塑性混凝土不同龄期的 Duncan- Chang E-μ模型参数 ,按照实际施工程序 ,考虑时空变化的影响 ,对二期围堰进行了应力变形三维有限元计算 ,分析了大规模抽水期和运行期围堰防渗墙应力特征和变形情况 ,同时将计算结果与实测结果及反馈分析结果进行比较。计算分析表明围堰堰体和防渗墙体是安全的。计算成果对围堰的长期稳定安全运行提供参考依据
The stress and deformation of the plastic concrete cut-off wall of the second-stage cofferdam of the Three Gorges Project is an important index to measure the safety of cofferdam. Due to the five-year period of the cofferdam, based on the Duncan-Chang E-μ model parameters determined at different ages of the plastic concrete experimentally determined, the cofferdam of the second stage was subjected to stress and deformation according to the actual construction procedure and considering the influence of the spatial and temporal changes Dimensional finite element analysis, the stress characteristics and deformation of cofferdam impermeable walls in large-scale pumping period and operation period are analyzed. At the same time, the calculated results are compared with the measured results and the feedback analysis results. Calculation and analysis show that cofferdam and impervious wall are safe. The calculated results provide reference for long-term stable and safe operation of cofferdam