Numerical Analysis of Unstable Seepage in Double Layer Dyke Foundation During Flood Fluctuations in Mountainous Rivers
The stability of seepage in dyke foundations has long been a key difficulty in dyke design,especially in mountainous rivers where floods fluctuate rapidly and have a short duration,making it difficult to form a stable seepage field.Therefore,it is necessary to consider the unstable seepage field of flood fluctuations in order to obtain the most eco-nomical and reliable seepage control measures.Based on the theory of unsaturated seepage,this paper studied the wetting process and seepage characteristics of unstable seepage in embankments during flood fluctuations in mountainous rivers,and compared with steady-state seepage.The results show that the front end of the infiltration line in the unstable seepage field is concave with hysteresis.Due to the relatively weak permeable cover layer of the double layer dyke foundation,the wetting distance inside the dyke is short,and the infiltration front has not yet reached the foot of the slope;The hydraulic gradient of typical parts of the upstream slope is significantly greater than that of stable seepage.When steady-state seep-age is used to analyze the seepage stability of double layer dyke foundations in mountainous rivers,the obtained results are more unfavorable for embankments.
万方数据
维普
