Large-Scale Experiment Related to Effects of Geogrid on Flotation of Buried Pipeline

概要

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The behavior of buried pipeline is influenced by ground water and subjected to uplift force. Therefore, pipeline must be installed to the suitable depth of cover to prevent from floating. Because of this condition, the construction cost of pipeline becomes much expensive. Since large diameter pipeline particularly needs to excavate a deep trench, it is significantly required to bury shallowly due to the declining budget of construction.This paper discusses the effect of geosynthetics for prevention from shallowly buried pipe floatation based on the results of large-scale pit tests using a FRPM pipe (∅1100). It is found that geosynthetics set on the pipe fixes to the backfill material around the pipe and that total weight of fixed material is effective against pipe floatation.In addition, a mechanism of prevention from floatation of pipe is estimated about the result that geosynthetics works not with simply pulled out mode but bending mode in the soil.
国際ジオシンセティックス学会日本支部の論文