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Số người truy cập: 75,104,053

 Effect of corrosion on the behavior of earth walls reinforced by steel elements
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Tác giả hoặc Nhóm tác giả: Chau T. L., Corfdir A. et Bourgeois E.
Nơi đăng: Proc. Int. CIGOS-2010 : High-rise buildings and Underground structures, 18-19 november, Paris.; Số: 1;Từ->đến trang: 1-14;Năm: 2010
Lĩnh vực: Kỹ thuật; Loại: Bài báo khoa học; Thể loại: Quốc tế


The technique of earth walls reinforced by steel strip or synthetic reinforcement is used for the construction of art structures for several decades. For urban infrastructure, itself gave an interesting solution to optimizing the use of space and can fit into modern architecture and landscape programs. An important aspect of these works reside in the steel reinforcements undergo electrochemical corrosion. This study presents numerical simulations of the behavior of reinforced earth walls induced by the corrosion of the reinforcement strips.
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 differenttypes 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.

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