Lateral loading model tests for buried pipe against thrust force backfilled with liquefied stabilized soil

Abstract

Liquefied stabilized soil has been used as a backfill material of pipelines recently. Methods for thrust restraint using liquefied stabilized soil are proposed in this paper. We expect that the liquefied stabilized soil is effective backfill material against the thrust force. Model pit tests using a model pipe with a diameter of 260 mm were carried out in order to examine the effect of the liquefied stabilized soil for the thrust restraint of the buried bend. The liquefied stabilized soil was applied to the passive area of the model pipe and dry silica sand was used as backfill material. The model pipe was laterally loaded at 1 mm/min after backfilling to simulate the thrust force. The lateral resistance and the lateral displacement of the model pipe were both measured.
The results showed that the lateral resistance in case using the reinforcement material was increased. Furthermore,it was verified that the types of reinforcement materials influenced the lateral resistance.