A NUMERICAL INVESTIGATION INTO CAUSES AND COUNTERMEASURESOF LARGELY-DEFORMED REINFORCED EARTH WALL WITHGEOSYNTHETICS

概要

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Numerical analysis was carried out in order to simulate the development of large deformation that tookplace on the reinforced earth wall, which was located as a part of the Tottori expressway planned to passHyogo, Japan. Since this reinforced earth wall had experienced unexpected deformation of the wallduring construction, the wall was re-constructed twice. However, the wall deformation showed no sign tocease even at the final stage of the construction. Accordingly, countermeasures to re-stabilize the wallwere demanded. It was successfully simulated that subsidence of a 3-meter weak soil due to seepage flowwas responsible for the large deformation. A part of concrete panel wall was severely damaged due toextremely large pulling force of geotextile induced by the hammock state. As for the countermeasures,"grouting with slag system" was applied to fill voids of the backfill, and also to prevent furtherdevelopment of settlement in the weak soil layer. "Ground anchor" was also considered to achieve theprescribed factor of safety.