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利用冶勒大坝已经获得的强震监测资料进行大坝坝体及覆盖层动力参数反演,采用三维非线性有限元动力分析方法,分析冶勒大坝在其已经遭遇的最大地震,即4级地震作用下的坝体动力加速度状况,并根据计算结果判别坝基覆盖层的液化情况,进而对冶勒大坝在所遭受的4级地震下的抗震安全性作出评价。其中坝体堆石料及覆盖层砂粒料静力计算时采用邓肯E-B模型,动力计算是采用Hardin模型,地震响应分析采用等价线性法。
Using the strong earthquake monitoring data obtained by Yele Dam, the dynamic parameters of dam body and overburden are retrieved, and the three-dimensional nonlinear finite element method is used to analyze the influence of Yele dam on the maximum earthquake that it has encountered, namely 4 Grade earthquake, and according to the calculation results, the liquefaction situation of the overburden of the dam foundation is judged, and then the seismic safety of the Yele dam under the magnitude 4 earthquake is evaluated. Duncan E-B model is used in static calculation of rockfill materials and overburden sand materials, Hardin model is used for dynamic calculation, and equivalent linear method is used for seismic response analysis.