EXPERIMENTAL STUDY ON THE EFFECT OF LIGHT-WEIGHT BACKFILL FOR ENHANCEMENT OF EARTHQUAKE RESISTANCE OF BURIED PIPELINES

摘要

In this paper, the effect of light-weight backfill was evaluated for reducing the soil-pipelines interaction. To investigate the effect of light-weight backfill, full-scale experiments were conducted. 100-mm-diameter pipeline was buried in the ground assuming a pipeline buried under roads. Then, the pipeline was pushed into the ground horizontally with a hydraulic jack and the reaction force was measured. The result showed that light-weight backfill had significant effect on the soil-pipelines interaction. In the case when EPS(Expand Poly Styrene) or EGW(Expanded Glass Waste) was used for backfill, the peak value of measured reaction force was less than that of the case when compacted sand was used for backfill. As a result, using light-weight for backfill in area where PGD is expected, the effect of reducing the soil-pipelines interaction and the earthquake-resistance can be increased.