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Your search keyword '"Muresan, Bogdan"' showing total 2 results
Start Over Author "Muresan, Bogdan" Topic internal erosion
2 results on '"Muresan, Bogdan"'

1. Internal erosion of chemically reinforced granular materials: a mathematical modeling approach

Author

KHALIL, Tony, Saiyouri, Nadia, Muresan, Bogdan, Hicher, Pierre-Yves, Matériaux Environnement Ouvrages (MEO), Institut de Recherche en Génie Civil et Mécanique (GeM), Université de Nantes - UFR des Sciences et des Techniques (UN UFR ST), Université de Nantes (UN)-Université de Nantes (UN)-École Centrale de Nantes (ECN)-Centre National de la Recherche Scientifique (CNRS)-Université de Nantes - UFR des Sciences et des Techniques (UN UFR ST), Université de Nantes (UN)-Université de Nantes (UN)-École Centrale de Nantes (ECN)-Centre National de la Recherche Scientifique (CNRS), and Institut Français des Sciences et Technologies des Transports, de l'Aménagement et des Réseaux (IFSTTAR)

Subjects
transport modeling, [SPI.GCIV]Engineering Sciences [physics]/Civil Engineering, internal erosion, [SPI.MECA.MEMA]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Mechanics of materials [physics.class-ph], chemically reinforced granular material, erosion tests
Abstract

International audience; Internal erosion (IE) affects the stability of natural and reinforced materials by causing instability within their granular structure. The dislodgement and transport of eroded particles affect both the particulate concentration of eroding fluid and the pore network of eroded material. In this study, we examined these modifications using a transport model with a finite element code. First, IE tests on chemically reinforced sand columns were performed to obtain information about eroded material loss of mass, particulate concentration of effluent, porosity and permeability modifications, and existing IE stages. Second, based on experimental results, a mathematical one-dimensional model has been formulated to monitor the evolution and spatial distribution of erodible solids, fluidized particles, porosity, permeability, and seepage stresses. The model consists of a set of coupled nonlinear differential equations solved in sequence. It provides valuable information about the extent and the dynamics of structural changes, which can be used to estimate an IE time for the hydraulic work to reach failure.

Published
2013

2. Internal erosion of chemically reinforced granular materials: A granulometric approach

Author

Muresan, Bogdan, Saiyouri, Nadia, Guefrech, Achraf, and Hicher, Pierre-Yves

Subjects
*SOIL erosion, *GRANULAR materials, *WATER seepage, *SILICA gel, *SOIL percolation, *SOIL sampling, *ENVIRONMENTAL monitoring
Abstract

Summary: Internal erosion (IE) of chemically reinforced granular materials results in dislodgement of particles from their rigid skeleton due to seepage stresses. Whether or not these particles can be dislodged and flushed out by seepage depends on (i) the amount of binding agent used to reinforce the granular matrix, (ii) the structure of pore network and (iii) severity of seepage stresses. Results of IE tests are presented for compacted-sand reinforced with increasing amounts of silica gel. The silica gel is a binding agent that permits low-permeability materials reinforcement. IE tests provided information about eroded particles, macro/micro-structural changes and indicators of ongoing IE mechanisms. For instance, data highlighted the existence of up to three IE stages. This includes flushing of movable particles, binder removal and subsequent releases then self-filtering of fine particles within the rigid skeleton. From the careful monitorings of effluent particles (in terms of concentrations and sizes), it was possible to gauge the dynamics of binder removal. Besides, it was also possible to follow changes in dimensions of the smallest constriction that drives travel distances of dislodged particles. [ABSTRACT FROM AUTHOR]

Published
2011
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