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Comportement mécanique de géocellules - application aux constituants de merlons pare-blocs cellulaires

Abstract : This study deals with the mechanical behaviour of geocells as possible components of rock fall protection dykes. These structures aiming at stopping falling rocks are placed across their probable trajectory. Geocells are metric structures associating a manufactured envelop together with a granular material.
Cells of concern are cubic and made of an hexagonal wire mesh and a geotextile and are filled with coarse granular material, sand or a mixture of sand and scrapped tyres.
The behaviour of individual cells was investigated experimentally under quasi-static and dynamic loadings. For low strain levels, The cell response under uni-axial compression appears to mainly depend on the filling material characteristics. The envelop influence the high strain level response. Under impact, by a 250kg spherical boulder, the capacity of a cell to restrict the stress on its support depends on the cell boundary conditions and, to a smaller extent, on the filling material. The optimum configuration consists of a laterally free to deform cell filled with the coarse granular material.
Numerical models of the materials and of the cells were calibrated and validated thanks to the experimental results.
The results were extrapolated to the structure scale with the aim of turning the choice for structural solutions for dykes to be submitted to impact experiments.
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https://tel.archives-ouvertes.fr/tel-00225981
Contributor : Stéphane Lambert <>
Submitted on : Wednesday, January 30, 2008 - 2:22:48 PM
Last modification on : Monday, May 18, 2020 - 2:35:19 PM
Long-term archiving on: : Tuesday, September 21, 2010 - 3:25:23 PM

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  • HAL Id : tel-00225981, version 2

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Stéphane Lambert. Comportement mécanique de géocellules - application aux constituants de merlons pare-blocs cellulaires. Sciences de l'ingénieur [physics]. Université Joseph-Fourier - Grenoble I, 2007. Français. ⟨tel-00225981v2⟩

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