2016 年 2 巻 68 号 p. 2330-2335
Over the world Terre Armée retaining walls have demonstrated impressively high performances after being submitted to very strong earthquakes. Sites investigations on 1,423 Terre Armée structures in Japan after the Great East Japan Earthquake of 2011 revealed that they present an impressive robustness and efficiency. Only 4 failures were observed, either caused by a lack of protection against scouring induced by the passage of the strong tsunami wave or caused by a general sliding. In Japan, the majority of Terre Armée retaining walls are built using High Adherence steel reinforcements. However, steel reinforcement cannot be used in marine areas or highly corrosive environments. For such aggressive environments synthetic reinforcements made of high tenacity fibers with a high stiffness are preferred. Our feedback on such structure exposed to earthquake motions is very positive, but not as well reference as for structures reinforced with steel. Nevertheless efforts are still needed to assess their performance under very strong motions. This paper introduces a numerical dynamic analysis to study Terre Armée retaining walls response to seismic loads. An overview of the modelling aspects will be given and the impacts of the reinforcement stiffness on the seismic performance will be shown. The paper will bring a relative comparison between the behavior of a wall reinforced with non-extensible reinforcements and a wall reinforced with relatively more extensible ones.
