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蓄水期谷幅变形影响着高拱坝当前工作性态和长期安全状况,但拱坝设计方法中尚没有相关的评价标准。首先总结蓄水期高拱坝坝址谷幅变形规律和常规数值方法计算的难点。从裂隙水压力的作用规律出发,在弹塑性模型屈服函数中引入静水压力,并应用于锦屏一级拱坝蓄水期计算分析。计算结果与监测值符合良好,初步解释谷幅收缩等坝址区山体变形现象。探索蓄水初期裂隙岩体的细观变形机制,提出非饱和、非贯通裂隙岩体中的有效应力原理。结果表明,裂隙水压力改变岩体平衡状态,是蓄水后坝址区岩体产生塑性变形的主要驱动力。
During the storage period, the deformation of the valley amplitude affects the current working behavior and long-term safety status of the high arch dam. However, there is no relevant evaluation standard in the arch dam design method. First of all, it concludes the difficulty of calculating the deformation law of the valley amplitude of the high arch dam during the water-filling period and the conventional numerical method. Based on the law of action of fissure water pressure, the hydrostatic pressure is introduced into the yield function of the elastoplastic model and applied to the calculation and analysis of Jinping I arch dam water storage period. The calculated result is in good agreement with the monitoring data, which initially explains the deformation of the mountainous area in the dam area such as valley shrinkage. Explore the mechanism of mesoscopic deformation of fractured rock mass during the initial water storage and put forward the principle of effective stress in unsaturated and non-through rock mass. The results show that changing the pressure of fractured rock to balance the rock mass is the main driving force for the plastic deformation of the rock mass in the dam site after water storage.