Detachment of dilatant soil due to high hydraulic shear stresses explained
| Autor: | Myron van Damme |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Dilatant
porosity pick-up 0208 environmental biotechnology Dilatancy 02 engineering and technology erosion 01 natural sciences complex mixtures shear failure 010305 fluids & plasmas 020801 environmental engineering Shear (geology) 0103 physical sciences Geotechnical engineering Porosity Geology Water Science and Technology Civil and Structural Engineering |
| Zdroj: | Journal of Hydraulic Research, 59 (2021)(1) |
| ISSN: | 0022-1686 |
| Popis: | When soil surfaces are exposed to high shear stresses induced by high-velocity water flows, they erode. Erosion consists of the detachment, entrainment and transport of soil particles. When exposed to high shear stresses the process of soil detachment is no longer given by the pick-up of individual particles but by the continuous shear failure of layers of soil. The understanding of how soil properties influence the detachment rate of soil is lacking. This paper presents how the bed shear stress, initial and critical porosity, hydraulic conductivity, and density influence the detachment rate of dilatant soils which are subjected to high-velocity flows. Based on the constitutive mass and momentum balance equations it is hypothesized that the exchange of mass and momentum during soil detachment corresponds with that situation for which the dilatancy induced shear resistance of the soil is maximum. The hypothesis is validated against high-velocity erosion experiments on sand. |
| Databáze: | OpenAIRE |
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