Investigation of Rate of Erosion of Soils in Embankment Dams
Publication: Journal of Geotechnical and Geoenvironmental Engineering
Volume 130, Issue 4
Abstract
The slot erosion test and the hole erosion test have been developed to study the erosion characteristics of soil in cracks in embankment dams. The erosion characteristics are described by the erosion rate index, which measures the rate of erosion, and the critical shear stress, which represents the minimum shear stress when erosion starts. Values of the erosion rate index span from 0 to 6, indicating that soils can differ in their rates of erosion by up to times. The rate of erosion is shown to be dependent on the soil fines and clay sized content, plasticity, and dispersivity; compaction water content, density and degree of saturation; and clay mineralogy, and possibly the presence of cementing materials such as iron oxides. Coarse-grained, noncohesive soils, in general, erode more rapidly and have lower critical shear stresses than fine-grained soils. Knowledge of the erosion characteristics of the soil in the core of an embankment dam aids in the assessment of the likelihood of dam failure due to piping erosion.
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Published In
Journal of Geotechnical and Geoenvironmental Engineering
Volume 130 • Issue 4 • April 2004
Pages: 373 - 380
Copyright
Copyright © 2004 American Society of Civil Engineers.
History
Received: Oct 18, 2002
Accepted: Jun 30, 2003
Published online: Mar 15, 2004
Published in print: Apr 2004
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