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 Finite element analysis of the effect of corrosion on the behavior of reinforced earth walls
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Tác giả hoặc Nhóm tác giả: Chau, T.-L., Bourgeois, E. and Corfdir, A.
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Nơi đăng: International Journal for Numerical and Analytical Methods in Geomechanics (SCI); Số: Vol. 36 (15);Từ->đến trang: pp. 1741–1756;Năm: 2012
Lĩnh vực: Kỹ thuật; Loại: Bài báo khoa học; Thể loại: Quốc tế
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The preliminary analysis of a database, gathering results of laboratory tests, performed on soil and steel samples extracted from wall built several decades ago, has shown the difference in behavior between different types of reinforcement strips, and the large scattering of data. It served as a basis to derive relationships between weight loss, ultimate strength and ultimate strain of reinforcement strips.
The presence of very thin strips compared to the size of the reinforced earth wall makes it interesting to use homogenization methods. We adopted a multiphase model, that makes it possible to get a satisfactory modeling of the tensile forces in reinforcement strips.
We studied four corrosion scenarios to take into account various situations in which corrosion rates can become significant. The spatial distribution of corrosion can have a clear influence on the behavior of the wall, the failure mechanism, and create complex redistributions of tensile forces between adjacent strips.
Parametric studies were carried out to investigate the effects of surcharges, and of some details of modeling, such as the junction between panels, or the junction between the reinforcement strips and the facing panels.
Results have been compared with measures obtained on full scale reinforced earth walls or on physical models, and with results of other numerical simulations.
Results provide elements for the definition of a strategy for the monitoring and the surveillance of reinforced earth walls.

Keywords: Reinforced earth wall, reinforcement strip, corrosion, weight loss, residual strength, finite element simulations, multiphase model.
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