渗流反分析及其在土石坝安全监控中的应用

Inverse Analysis on Seepage in Safety Monitoring for Earth-rockfill Dam

结合土石坝测压管水位的观测资料,采用有限元方法以各测点水位计算值与实测值的最优化拟合准则,建立渗透系数的反分析模型,利用对数变换将有约束优化转为无约束优化。以浙江省某土石坝渗流分析为例,反演出大坝各个分区材料的渗透系数,并以此进行各种典型工况下坝体的有限元渗流计算,建立了能反映大坝实际渗流性态的预测模型。

Based on the rule of the optimal fitting between the FEM calculated piezometric level values and the observed one from the observation points within earth-rockfill dam, a model for seepage coefficient inversion analysis is established. The logarithmic transformation method is used to transform the restrained optimization into the unrestrained one during the inverse analysis. An earth-rockfill dam in Zhejiang Province is taken as the actual analysis case. The coefficient of percolation of each subfield is inverse＆ The FEM seepage calculation in each typical control condition is ran based on the inverse results, and a prediction model which can show the situation of the factual seepage of the dam is established.