RESUMO
In Japan, everyday life would be seriously affected by damage to the infrastructure resulting from an earthquake, since most lifeline facilities are buried. Given those circunstances, studies of the damage caused to underground structures due to liquefaction have began over the past few years. However, most studies have concentrated on the behavior of buried structures in liquefied ground, with few taking into consideration the process by which the ground is liquefied or the large permanent displacements produced by liquefaction. Accordingly, we have traced the mechanism of damage to lifeline facilities, specifically buried pipelines, with the lapse of time, based on knowledge obtained from past experimental results. We carried out stress analysis on buried pipelines during the liquefaction process and looked for correspondence between the analytical results and the temporally equivalent results of effective stress analysis.(AU)
