Model experiment on the horizontal resistance force of buried pipe in liquefied ground
2015
Itani, Y. (Kubota Corporation, Osaka (Japan)) | Fujita, N. | Sawada, Y. | Ariyoshi, M. | Mohri, Y. | Kawabata, T.
Generally, the damage of pipeline becomes heavy when liquefaction occurs. However, the seismic behavior of pipeline in the liquefied ground is unknown enough. Therefore, the seismic design are not established systematically. In particular, the thrust force due to internal pressure constantly acts on pipe bend of the pressure line, such as irrigation pipelines. The resistance for the thrust force is passive earth pressure behind the pipe bend, but it is not considered that the passive earth pressure decreases when the liquefaction occurs. In the present study, model experiments were carried out in order to discuss the mechanical behavior of the pipe bend laterally loaded in the liquefied ground. As a result, it was revealed that the horizontal displacement of the pipe is increase and the horizontal resistance force is decrease significantly during liquefaction. In addition, it was found that the coefficient of subgrade reaction in the liquefied ground was reduced to 1/7 to 1/8 compared to that in non-liquefied ground.
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