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    Volume 42, Issue 6 (November 2019)

    A New Physical Model for Studying Flow Direction and Other Influencing Parameters on the Internal Erosion of Soils

    (Received 3 September 2017; accepted 14 September 2018)

    Published Online: 2019

    CODEN: GTJODJ

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    Abstract

    In internal erosion studies, the effect of seepage flow direction in soil and soil layers has received little attention. However, in geotechnical structures, such as earth dams or even natural deposits, the flow may not be perpendicular to the layers or in line with the gravity. Hence, in this article, a special physical model is introduced with both the possibility of changing the flow angles relative to the direction of gravity and the possibility of studying heterogeneous specimens in internal erosion. In addition, the effect of flow direction, inclination of layers, and plasticity index on the internal erosion (suffusion) of gap-graded soil with two types of fines, bentonite and rock flour, has been tested and analyzed. Additionally, a new method for specimen preparation of the gap-grading soils called the “ideal moisture content method” has been presented. Based on the results, the greater the angle of the flow vector is in relation to the direction of gravity; the occurrence and continuation of erosion takes place in higher gradients. Furthermore, in general, in the case of layers perpendicular to the flow, the rate of flow discharge and amount of the eroded particles in the same conditions are less than those of layers parallel with the flow. Moreover, layer direction affects the shape of pipes created because of the erosion.

    Author Information:

    Pachideh, Vahid
    Civil and Environmental Engineering Faculty, Amirkabir University of Technology, Tehran,

    Mir Mohammad Hosseini, S. Majdeddin
    Civil and Environmental Engineering Faculty, Amirkabir University of Technology, Tehran,


    Stock #: GTJ20170301

    ISSN:0149-6115

    DOI: 10.1520/GTJ20170301

    Author
    Title A New Physical Model for Studying Flow Direction and Other Influencing Parameters on the Internal Erosion of Soils
    Symposium ,
    Committee D18