水位周期性涨落条件下河道边坡非饱和渗流稳定分析OA

A certain embankment in a tributary of the Taihu Lake Basin was constructed with clayey silt fill.During its service period,affected by periodic water level fluctuations,it encountered problems such as differences in compaction degree between new and old fill materials and local deformation.Its seepage stability faced severe challenges.To assess its safe service performance,finite element software was used to simulate the transient seepage field under different water level change rates and their influence on embankment stability.The study shows that the water level rise and fall rate has a significant impact on the stability of the water-facing slope.At high rates,the safety factor of the water-facing slope in the low water level section is lower than the critical value of 1.3;the backwater slope only has instability risks in specific water level sections and is less affected by the rate;seepage failure of the embankment shows an obvious correlation with location and rate,and the core inducement is the dynamic variation of pore water pressure and effective stress caused by water level fluctuations.The research results can provide technical support for the safety control of such embankments.