Spatial and temporal progression of internal erosion in cohesionless soil
- 1 March 2011
- journal article
- Published by Canadian Science Publishing in Canadian Geotechnical Journal
- Vol. 48 (3), 399-412
- https://doi.org/10.1139/t10-071
Abstract
Permeameter tests were performed on four widely graded cohesionless soils, to study their susceptibility to internal erosion. Test specimens were reconstituted as a saturated slurry, consolidated, and then subjected to multi-stage seepage flow under increasing hydraulic gradient. The occurrence of internal instability is described qualitatively, from visual observations through the wall of the permeameter during a test and from post-test observations; it is also described quantitatively, from change of hydraulic gradient within the specimen and from axial displacement during a test. The results provide a novel insight into the spatial and temporal progression of seepage-induced internal instability. This insight yields an improved characterization of suffusion and suffosion in cohesionless soils, the progression of which appears governed by a critical combination of hydraulic gradient and effective stress.Keywords
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