Abstract
In a road excavation to lay a gas distribution pipeline, the re-use of the excavated soil for the subgrade backfill greatly reduces the environmental impact. However, when Kanto loam soil, which is widely distributed in the Kanto region, is employed for the backfill material, the relationship between the amount of the subsidence of the subgrade soil and the cyclic traffic loading is needed. In this study, cyclic loading tests on Kanto loam soil were conducted to investigate the subsidence characteristics. The subsidence prediction method of Kanto loam soil based subgrade under cyclic traffic loading was proposed using the cyclic loading test results. A full scale traffic loading experiments against road beds backfilled with Kanto loam soil were carried out. Consequently, a good correlation was shown to exist between the amount of the predicted subsidence and the measurement results.
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