Abstract
Due to the 2004 Nigata-ken Chuetsu earthquake, a lot of fill structures collapsed. It seems that strength of fill structures was loosed because of rainfall induced by typhoon before this earthquake. So, using a set of numerical analyses, we evaluated correlation between rainfall and earthquake in the damages of a lot of fill structures. In this paper, we introduce the outline of collapsed fills, laboratory tests of fill materials, methods of numerical analyses, and the results of infiltration analysis. We choose the fills in the vicinity Jouetsu Line 220k300m and 221k000m. Both of these fills were damaged severely and re-constructed with reinforced soil. A set of methods of numerical analyses consists of infiltration analysis, dynamic analysis and Newmark's method. Using infiltration analysis, we evaluated moisture-content state of the collapsed embankments and rainwater drainage of the reconstructed embankment.
