Abstract
Determination of erosion characteristics is of great significance to
assess the stability of geotechnical infrastructures that are subjected
to seepage. Hole erosion tests (HETs) are the popular and simple
laboratory measurements that have been used to determine erosion
characteristics. These tests are indicative of the quantity of soil loss
in term of internal erosion that can occur during seepage. It is noted
that there are not many studies that focus on the development of
theoretical model describing the erosion process (i.e. sediment
detachment and transport) in HETs. The aim of this study is to propose a
theoretical model based on Bernoulli’s principle to interpret the
erosion measurements from HETs and employ the results for estimating
erosion characteristics of soils. An analytical equation was deduced
from a physically based model incorporating Bernoulli’s principle and
erosion constitutive law for internal erosion within a soil pipe driven
by pressure gradient. The analytical equation could be applied to
determine the temporal development of eroded soil loss, radial erosion
propagation, erosion rate, hydraulic shear stress, and pressure drop.
The utility of proposed analytical solution was validated using a series
of HETs performed in this study. Based on the novel analytical solution,
erosion characteristics could be derived from the known realistic
propagation of radial erosion.