Abstract
In the pipeline, the thrust force depending on the bending angle and internal pressure constantly acts on the bend. The passive earth pressure behind the bend is expected to resist the thrust force, but actually, the passive earth pressure decreases drastically when the liquefaction occurs. The seismic design method for the pipeline under the liquefaction is yet to be established. In this study, shaking experiments were carried out in order to discuss the dynamic behavior of flexibly jointed pipeline with a bend in the liquefied ground. As a result, it was clarified that the crushed stone foundation alone is insufficient countermeasure against liquefaction. In addition, it was confirmed that the chain structure pipeline is effective against the displacement of the bend.
