Liquefaction Resistance of Sandy Soil Stabilized by Lime Admixture

Abstract

While rural sewerage pipelines were severely damaged by liquefaction of backfill soil during the Niigataken Chuetsu-oki Earthquake in 2007, a large length of the sewerage pipelines, which had been damaged by the liquefaction during the Niigataken Chuetsu Earthquake in 2004 and been repaired by backfilling the sandy soil stabilized by lime admixture, escaped unharmed. In the paper the damages of the rural sewerage pipelines caused by the Niigataken Chuetsu-oki Earthquake in 2007 are investigated to show effectiveness of the liquefaction countermeasure using the backfill soil stabilized by the lime admixture. Then, in order to evaluate quantitatively the liquefaction resistance of the stabilized soil, a series of unconfined compression test is carried out. The test results show that, in the case of addition of 5% quantity in dry mass of lime admixture, the unconfined compression strength of the stabilized soil reaches more than the liquefaction resistance required for of the backfill soil. However, as this strength increases with curing time, some difficulty may be expected in re-excavating the stabilized soil in the future. To solve this, it is recommended that the lime-added soil should be left without compaction during some period before backfilling. It is also shown that the stabilized soil inconveniently decreases its unconfined compression strength after immersing into the water.