双层地基防渗措施在实际工程中的应用

Application of Double-layer Foundation Seepage Control Measures in Actual Project

堤基中若表层土透水性较弱,下部透水性较强,两层的渗透系数之比>100即可称为双层地基。盖重是在堤坝下游原覆盖层上加土设置的压重层,以平衡下卧砂层剩余水头的顶托力,防止流土沙沸等渗透破坏。通过七台河倭肯河治理工程实例,介绍了双层地基的渗流计算和盖重的计算等。

If the surface layer of a dike is less permeable layer,and underlying layer of the dike is highly permeable layer with hydraulic conductivity more than 100,it is a double-layer foundation.Constructing weighting soil layer is to lay a weight soil layer at downstream toe,so as to balance the residual hydraulic head of underlying sand layer and control seepage damage caused by piping.Taking Qitaihe Wokenhe River Regulating Project as an example,the paper introduces the seepage calculation and calculation for constructing weighting soil layer.