バラスト軌道の地震時変形挙動

摘要

A number of researches have been implemented on the safety of ballasted track to minimize the degree of damages by earthquake. Nevertheless, sufficient knowledge has not been obtained yet on the dynamic behaviors of ballasted track itself. Against the above background, firstly the authors carried out a static analysis in order to evaluate stability against track buckling of straight track of continuous welded rails. Secondarily the authors carried out a dynamic analysis about ballasted track on ground and on structure during earthquake, using parameters of lateral peak resistance of ballast, degree of earthquake, etc., and examined the dynamic behavior of ballasted track during earthquake.%地盤上および構造物上のバラスト軌道の地震時変形挙動について，今回対象とした解析条件，解析モデルを基に得られた知見をまとめると以下のとおりである。（1）地震時における軌道に対する動的作用と最終道床横抵抗力の低下により，地震動の大きさ，最終道床横抵抗力の低下の程度，構造物の諸元によっては大きなレール横変位が生じる。