Relationship between soil erodibility and engineering properties

Characteristic of Erosion Properties and Relationship With Geotechnical Properties for Red Riverbank Soil in Hanoi, Vietnam

“…(Figure 12 to Figure 15). The results on the relationship of the critical shear stress and the erosion curve slope in this research have the same trend as results in most previous research (Shafii et al 2016;Panagiotopoulos et al 1997). Especially, it can see that the clay content had a great effect on the critical shear stress when the soil has clay content higher than 11% and cause dramatically with the clay content reach up 50% as concluded in (Panagiotopoulos et al 1997).…”

“…5: Finally, the results are presented by the erosion curve as shown in Figure 8, is relationship between the soil erosion rate and the water flow shear stress. In the curve relating soil erosion rates and water stress, the critical shear stress ( c  ) is defined as the stress value at which soil begins to erode, at which the soil erosion rate as 0.1 mm/hour (Shafii et al 2016).…”

“…The erosion properties are important factors in the analysis of riverbank cantilever failure (Darby et al 2007;Simon et al 2011;Yong et al 2014;Patsinghasanee 2018;Toan and Duc 2019), and riverbank failure risk (Abidin et al 2017). They include the critical shear stress, the initial erosion slope, the erosion curve slope, the erosion rate (Shafii et al 2016). The critical shear stress as the threshold of soil erosion is the flow shear stress at which soil starts erosion.…”

“…The critical shear stress may difficult to directly measure during the erosion test, which can be determined by the erosion curve (the graph of shear stress versus the soil erosion rate). In the erosion curve, the critical shear stress is value responding to the erosion rate of 0.1mm/hour and at which the line of the first two points of the erosion curve crosses with the horizontal axis (Shafii et al 2016). The measurement technique for determining the soil erosion properties can be carried out in laboratories using a channel flume set up lateral (Bo et al 2011;Yu et al 2015;Patsinghasanee et al 2018) or on the bottom of a water flow channel (Briaud 2008;Badr et al 2002) with the abundant size of length and width as the shape of the flume.…”

“…The most meticulous and successful results of the relation between soil properties and the erosion rate were found in a series of studies and papers published by Briaud and his colleagues (Shafii et al 2016;Briaud 2008;Briaud et al 1999Briaud et al , 2001aBriaud et al , 2001b. Based on 15 years of erosion testing experience using erosion function apparatus (EFA), a series erosion categories depending on the classification of soils or rocks was proposed (Briaud 2008).…”