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نویسندگان مقالات پربازدید :
اولین کنفرانس ملی مهندسی ژئوتکنیک ایران
جزئیات رویداد
همایش ، رویداد ، ژورنال
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  • identification and management of dispersive soils

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    جزئیات بیشتر مقاله
    • تاریخ ارائه: 1392/07/24
    • تاریخ انتشار در تی پی بین: 1392/07/24
    • تعداد بازدید: 730
    • تعداد پرسش و پاسخ ها: 0
    • شماره تماس دبیرخانه رویداد: -
     dispersive clay soils collapse or disperse to form dissolved slurry when in contact with water. these soils are highly prone to erosion often leading to tunnel and gully erosion. unlike other forms of erosion, dispersion and tunnel erosion result from an imbalance in soil chemistry. dispersion of soil occurs when it is wetted and the clay particles are forced apart. thus dispersive soils erode under small seepage velocity leading to problems of stability of earth and earth retaining structures. the extent of dispersion depends on mineralogy and clay chemistry as well as the dissolved salts of the pore fluid. soil dispersivity is mainly due to the presence of exchangeable sodium present in the structure. the attractive forces are less than the repulsive forces under saturated conditions and this will help the particle to segregate and to move in suspension. many structures are built, on and through clay soils, because of their low permeability. in the past dispersive clay soils were not recognized, and failure of several structures occurred before dispersive action was identified. this article presents description of characteristics and problems of dispersive clay soils, tests for identifying and approaches for minimizing erosion risk in dispersive soil.

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