Suffusion assessment by self-filtration criteria

To, H.D., Scheuermann, A., and Nguyen, C.T. (2014) Suffusion assessment by self-filtration criteria. In: Proceedings of the IAHR Asian and Pacific Regional Division Congress. From: IAHR Asian and Pacific Regional Division 2014 Congress, 21-24 September 2014, Hanoi, Vietnam.

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Suffusion is a major reason, related to nearly half of dysfunction of dams and embankments. The suffusion starts when fine soil particles are mobilised and transported through constriction formed by the primary fabric. This transport leads to an increase of soil porosity and, thereby, a stronger seepage flow. When the flow is strong enough, the primary fabric might collapse and be restructured at the micro scale. This deformation can be accumulated and, then, lead to the internal erosion at the macro scale. Therefore, the suffusion assessment is of vital importance in risk assessments for hydraulic constructions. Many recent suffusion assessment methods assumed that there is a sharp boundary in soil particle size distribution, which divided it into two parts: primary fabric and transportable particles. This paper represents a new assessing method, developed on a recent numerical approach that there is a transitional zone between primary fabric and transportable particles in the particle size distribution of soils. The new method correlates the particle size distribution of the transportable fraction and the constriction size distribution constriction size distribution formed by the primary fabric. The constriction size distribution is calculated by a probabilistic method. The application of the new assessing method on experimental data shows good, coherent results.

Item ID: 46006
Item Type: Conference Item (Presentation)
Date Deposited: 31 Oct 2017 01:56
FoR Codes: 09 ENGINEERING > 0905 Civil Engineering > 090501 Civil Geotechnical Engineering @ 100%
SEO Codes: 87 CONSTRUCTION > 8702 Construction Design > 870201 Civil Construction Design @ 100%
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