American Society of Civil Engineers


Experimental Bench for Study of Internal Erosion in Cohesionless Soils


by D. Marot, (University of Nantes, Institut GeM, BP 420 44606 Saint-Nazaire Cedex, France. E-mail: didier.marot@univ-nantes.fr), Y. Sail, (University of Nantes, Institut GeM, BP 420 44606 Saint-Nazaire Cedex, France. E-mail: yacine.sail@univ-nantes.fr), and A. Alexis, (University of Nantes, Institut GeM, BP 420 44606 Saint-Nazaire Cedex, France. E-mail: alain.alexis@univ-nantes.fr)
Section: Erosion of Soils, pp. 418-427, (doi:  http://dx.doi.org/10.1061/41147(392)40)

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Document type: Conference Proceeding Paper
Part of: Scour and Erosion
Abstract: Under the internal flow, hydraulic earth structures (dikes, levees, or dams) can incur a migration of particles that can induce a modification of hydraulic and mechanic characteristics. With the objective to characterize this phenomenon named internal erosion and its consequences on mechanical behaviour of granular materials, a large oedopermeameter device is developed. An axial load is applied on specimen and also a downward flow with a constant hydraulic gradient. During the testing time, the bench can measure the spatial variability of density and of interstitial pressure along the specimen. Axial deformation, injected flow and eroded mass are also measured during the testing time. Erosion of fine particles on downstream specimen part is accompanied by fine particles migration in the specimen. This migration induces a settlement and an increasing of interstitial pressure. Afterwards a localized instability appears and triggers specimen deformation.


ASCE Subject Headings:
Soil erosion
Cohesionless soils
Hydraulic structures
Soil structures
Mechanical properties