The headcut migration describes the physical process of breach side slope retreat that governs the widening of the breach. Modeling the growth of a breach due to embankment failure is the first step in mapping the resulting inundation in a floodplain. As removal of soil from the toe of the headcut effectively removes physical support for the upper part, the headcut fails on the plane normal to the direction of tensile stress. This process is a typical mode of tensile failure. A numerical model of the headcut migration was established by integrating the effects of the soil tensile strength, soil permeability and embankment geotechnical characteristics. Thus, a simple analytical equation was finally obtained to predict the critical length of the headcut. Furthermore, the presented model was verified by using the limit equilibrium method (LEM) for three typical embankment scales (2, 4 and 6 m high). The comparisons between the present model and the LEM show good agreements. The present model could provide a simple method to predict the critical length of the headcut migration and easily be adopted to breach widening models.
The headcut migration describes the physical process of the levee side slope retreat and the headcut length governs the breach widening. As a typical mode of slope stability due to soil tensile failure, the limit equilibrium method was used for the calculation of the headcut length. By considering the soil tensile stress state, the Hoek-Brown failure criterion provides a reasonable description of the levee material response. Then, the headcut length was calculated by using LEM in Slope/W. The comparisons with a large scale test show that the calculated headcut length by using LEM in Slope/W has good agreements with the measured data.
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