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Experimental Investigation on Suffusion Characteristics of Cohesionless Soils Along Horizontal Seepage Flow Under Controlled Vertical Stress
Frontiers in Earth Science ( IF 2.9 ) Pub Date : 2020-05-14 , DOI: 10.3389/feart.2020.00195
Gang Deng , Liang-Liang Zhang , Rui Chen , Lei-lei Liu , Kai-Xiang Shu , Zhi-Le Zhou

Suffusion is one of the main modes of internal erosion leading to selective erosion and gradual migration of fine soil particles through the voids of soil skeleton formed by coarse soil particles under seepage flow. Suffusion may induce deterioration and even failure of hydraulic geo-structures, such as embankment dams, dikes, levees, as well as landslide dams, if they are formed by gap-graded cohesionless soils. Soil mass in the hydraulic geo-structures is always subjected to overburden load and seepage through the soil mass generally has a large component along the horizontal direction. In the literature, however, little attention has been paid to the horizontal seepage-induced suffusion under controlled vertical stress. In this study, horizontal seepage-induced suffusion tests were carried out using a testing apparatus with controllable vertical stress and hydraulic gradient. The seepage flux and eroded fine particle mass, as well as local hydraulic gradients can be measured. The effects of initial dry density and initial fines content on suffusion characteristics of a cohesionless soil were investigated. Test results showed that after the initiation of suffusion, alternate decrease, and increase in the coefficient of permeability occurred possibly due to alternate clogging and dredging of soil pores by the movable fine particles. Uneven distribution of local hydraulic gradients along the flow path was observed and this could be regarded as a sign of the initiation of suffusion. Both initiation and failure hydraulic gradients increased with initial dry density and initial fines content.



中文翻译:

垂直应力控制下无粘性土沿水平渗流渗流特性的试​​验研究

渗流是内部侵蚀的主要模式之一,可导致选择性侵蚀和土壤细颗粒逐渐通过渗流下由粗土颗粒形成的土壤骨架的空隙逐渐迁移。如果堤坝由无间隙等级的无粘性土形成,则积水可能会引起水坝土工结构(例如堤坝,堤防,堤防和滑坡水坝)的恶化甚至破坏。水力地质结构中的土壤质量总是承受超负荷,并且贯穿土壤质量的渗透通常在水平方向上具有很大的分量。但是,在文献中,在受控的垂直应力下很少注意水平渗漏引起的注水。在这个研究中,使用具有可控制的垂直应力和水力梯度的测试设备进行水平渗水诱导的灌水测试。可以测量渗流和侵蚀的细颗粒质量,以及局部水力梯度。研究了初始干密度和初始细粉含量对无粘性土的渗水特性的影响。试验结果表明,灌水开始后,可移动的细颗粒交替堵塞和疏通土壤孔隙,可能会导致交替降低和渗透系数增加。观察到沿流动路径的局部水力梯度分布不均匀,这可以看作是灌流开始的迹象。

更新日期:2020-05-14
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