呉市中央地区の小学校通学路における石積み擁壁の地震ハザードマップ

摘要

We create a hazard map of Route-to/from-School for stone masonry walls in Kure city based on an earthquake scenario in order to indicate the danger zone for the public. The seismic stability of the stone masonry walls is evaluated using DDA (Discontinuous Deformation Analysis), which is a type of discrete element method and suits to solve the large displacements accompanying the discontinuous movements between blocks. First, we survey the detail of the stone masonry walls along the Route-to/from-School and examine the accuracy for simplifying the analytical model. Then, we estimate the seismic stability and possible dispersed areas of the stones from the collapsed walls based on an earthquake scenarios. Finally, we create a hazard map of Rotite-to/from-School for stone masonry walls in Kure city.%石積み擁壁は，現地の転石を利用し，かつ，コンクリート壁と比rnべて周囲の風景とも調和が取れる景観的にも良好な構造物であり，rn国内外で多用されている。地震国である我が国において，城壁などrn数百年も渡り健全性を保持している石積み擁壁む存在するが，2001rn年芸子地震の呉市，2005年福岡県西方沖地震の玄界島においては，rn多数の石積み擁壁が崩壊した。