Relationship Between Erodibility and Properties of Soils (2019) / Chapter Skim
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11 1.1 Definition of Erosion The phenomenon of erosion is the result of interaction between three main components: the erodible material, the eroding fluid (in most cases water) , and the geometry of the obstacle affecting the flow.
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12 Relationship Between Erodibility and Properties of Soils in the embankment, which is known as a "pipe." Other factors, such as hydraulic fracturing or poor compaction of the soil, also potentially might cause some cracking through the core of the dam, which can result in piping. Similar to the definition made by Terzaghi and Peck (1948)
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Introduction 13 3. Due to the turbulence in the water, the normal stress and the induced shear stress on the hydraulic interface between the eroding fluid and soil fluctuate.
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14 Relationship Between Erodibility and Properties of Soils at the interface between the water and the soil. A more fundamental definition is the relationship between the erosion rate and the shear stress at the soil–water interface.
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Introduction 15 tc = threshold or critical shear stress (N/m2) below which no erosion occurs, r = mass density of water (kg/m3)
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16 Relationship Between Erodibility and Properties of Soils 2. Rate of change in the soil volume during a specific time period while the soil is subjected to a hydraulic shear stress induced by the eroding fluid flow; and 3.
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Introduction 17 1.4 Research Approach and Project Tasks The goal of this project was to develop reliable and simple equations that link the erodibility of soils to commonly determined soil properties. The use of the results is to provide valuable input in erosion studies on topics such as bridge scour, river meander migration, roadway embankment overtopping, and others.
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18 Relationship Between Erodibility and Properties of Soils 1.4.2 Identification of Current Soil Erodibility Data Correlations In the identification of current erodibility data correlations, available data on the following subjects were collected: soil erodibility parameters (i.e., critical velocity, critical shear stress, initial slope of the erosion rate versus velocity or shear stress curve) , and common soil properties.
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Introduction 19 analyses were conducted. This analysis was followed by regression and optimization techniques (i.e., cross validation)
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