Abstract
Soil erosion is a complex phenomenon which yields at its final stage to insidious fluid leakages under the hydraulic infrastructures known as piping and which are the main cause of their rupture. The Hole Erosion Test is commonly used to quantify the rate of piping erosion. In this work, The Hole Erosion Test is modelled by using Fluent software package. The aim is to predict the erosion rate of soil during the hole erosion test. The renormalization group theory – based k–ε turbulence model equations are used. This modelling makes it possible describing the effect of the clay concentration in flowing water on erosion. Unlike the usual one dimensional models, the proposed modelling shows that erosion is not uniform erosion along the hole length. In particular, the concentration of clay is found to increase noticeably the erosion rate.
Highlights
Many dam ruptures events have occurred throughout the world, some of them were reported by Foster et al [1]
Soil erosion is a complex phenomenon which yields at its final stage to insidious fluid leakages under the hydraulic infrastructures known as piping and which are the main cause of their rupture
Unlike the usual one dimensional models, the proposed modelling shows that erosion is not uniform erosion along the hole length
Summary
Many dam ruptures events have occurred throughout the world, some of them were reported by Foster et al [1]. The common feature for all the continuum-based models is that they require establishment of the conditions under which sand failure will occur. They use for that some parameters which are calibrated with laboratory tests or field observations in order to predict when erosion starts and the expected erosion rate. A model for interpreting the HET with a constant pressure drop was developed by Bonelli and Brivois [6] This model yielded a characteristic erosion time which was found to be depending on the initial hydraulic gradient and the soil coefficient of erosion. A Computational Fluid Dynamics (CFD) approach will be used to investigate the shear stress that develops at the water/soil interface and which represents the main mechanical action that cause surface erosion
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