TITLE:
Assessment of the Internal Instability for Granular Soils Subjected to Seepage
AUTHORS:
Marx Ferdinand Ahlinhan, Marius Bocco Koube, Codjo Edmond Adjovi
KEYWORDS:
Internal Instability, Granular Soils, Seepage, Dams, Dykes, Site Specific Assessment, Instability Index
JOURNAL NAME:
Journal of Geoscience and Environment Protection,
Vol.4 No.6,
June
13,
2016
ABSTRACT: The knowledge
of the internal stability of granular soils is a key factor for the design of granular
and filter for the geotechnical infrastructures such as dykes, barrages, weirs and
roads embankment. To evaluate the internal instability of granular soils different
criteria are generally used in the practice. However, the results of these criteria
on the same soil may lead to different evaluations of the internal instability.
In this paper the common criteria used for the internal instability have been presented
and compared as far as possible. It was found that the most internal instability
criteria define a limit value for the secant slope of the grain size distribution
curve of the granular soils. Based on this finding an own criterion for the evaluation
of the internal instability of granular soil has been developed and compared to
the common criteria. A very good agreement between some criteria was found. Furthermore,
a site specific assessment for the evaluation of the internal instability of granular
soil has been proposed in order to get more confidence in this evaluation.