双层堤基渗流变形特征分析及管涌防治

Analysis of Seepage Deformation Characteristics of Double Layer Dyke Foundation and Piping Prevention

通过对双层堤基地下水渗流条件及变形特征的探讨分析,得出双层堤基地层岩性在下伏层细颗粒含量较多的时候,上覆粘性土层在一定条件下无法承受短时间内逐渐增大的地下水水压力时,粘性土层薄弱处将被高压水流顶穿发生管涌,下伏层中细颗粒不断地被地下水流带出土体,致使粘性土层产生渗透变形破坏.在初步分析了双层堤基渗流变形特征分析的基础上,本文初步分析及探讨管涌险情的探别,并提出了合理的防治措施.

Through the discussion and analysis of the seepage condition and deformation characteristics of underground water in the double-layer dike foundation,it is concluded that the lithology of the double-layer embankment foundation is higher when the content of fine particles in the underlying bed is higher. When the overlying clay layer can not bear the pressure of groundwater water gradually increasing in a short period of time,the weak part of the viscous soil layer will be piped through by high pressure water flow,and the fine particles in the underlying layer will be continuously carried out by the groundwater flow out of the soil. Causes the clay soil to produce the seepage deformation destruction. On the basis of preliminary analysis of seepage deformation characteristics of double-layer embankment foundation,this paper preliminarily analyzes and probes into the exploration of piping danger situation,and puts forward reasonable prevention measures.