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为准确评估拱坝初次蓄水期工作性态,对结构变形监测数据进行主因素回归分析,考虑坝体浇筑过程、蓄水过程、气温变化和时效分量等将各影响分量分离,根据分离后单纯水压变形分量,采用有限元分析方法对坝体结构弹性模量进行反演,得到实际表现力学参数,然后采用仿真分析方法并结合反演力学参数预测结构后期工作性态。以小湾拱坝为例,结果显示,坝体顺河向变形主要由水压荷载决定,但温度变形对坝体变形影响明显;短期荷载作用下结构实际表现弹性模量远高于设计值,与试验值接近;坝体顺河向变形、诱导缝和建基面法向应力等整体分布和变化规律计算值与实测值相同,仿真计算结果与实测值吻合良好,验证了方法的有效合理性。
In order to accurately evaluate the working performance of arch dam during the initial impounding period, the principal component regression analysis of structural deformation monitoring data was carried out, and the influencing components were separated considering the pouring process, water storage process, temperature change and aging component. According to the analysis results, Hydraulic deformation component, the finite element analysis method is used to inverse the elastic modulus of the dam structure to obtain the actual mechanical parameters, and then the simulation analysis method and the inversion mechanics parameters are used to predict the post-structural working behavior. Taking Xiaowan arch dam as an example, the results show that the dam deformation is mainly determined by the hydraulic load, but the temperature deformation has a significant effect on the deformation of the dam. The actual elastic modulus of the structure under short-term load is much higher than the designed value, Which is close to the experimental value. The calculated values of the whole distribution and variation regularity of dam along the river deformation, induced joint and foundation surface normal stress are the same with the measured values. The simulation results are in good agreement with the measured values, which verifies the validity and rationality of the method .