渗流反分析在土石坝安全评价中的应用

以土石坝渗流场中各测点水位的实测值与计算值的最优化拟合准则，建立渗透系数的反演模型，并以青山水库主坝渗流分析为例，根据多个渗流观测点数据，反演出大坝各个区域的渗透系数．在渗流反演优化过程中利用对数变换将有约束优化转为无约束优化．根据反分析的结果对大坝的渗透安全进行分析评价，取得了良好的效果，为大坝的安全评价提供了重要依据．

Inverse analysis on seepage in safety evaluation for earth-rockfill dam

Based on the rule of the optimal fitting between the observed values and the calculated one from all the observation points in the seepage field within earth-rockfill dam,a model for seepage coefficient inversion is set up,in which the seepage analysis on the dam of Qingshan Reservoir is taken as the actual analysis case,and the seepage coefficients in all the zones of the dam are inverted according to the observed values from several observation points therein.During the inverse analysis,the logarithmic transformation method is used to transform the restrained optimization into the unrestrained one.With the result of the inversion,the seepage safety of the dam is evaluated effectively,which provides an important basis for dam safety evaluation.