Influence of compaction conditions on the liquefaction characteristics of pumice sand with non-plastic fines

Abstract

In this study, the liquefaction characteristics of pumice sand were investigated focusing on the relationship with compaction conditions. The new findings obtained in this study are summarized as follows. In the pumice sand with a large amount of non-plastic fines, liquefaction resistance RL20 can be expected to be only about 0.2 at a degree of compaction of 90%, however, it can be increased to be 0.3 or more if the soil is densified by compaction up to degree of compaction of 95% or more. In addition, the skeletal structure is also important even at the same dry density, and a higher liquefaction resistance can be expected under the compaction conditions on a dryer condition in water content at compaction. On the other hand, the tenacity for deformation in liquefaction under cyclic loading may be lost in the compaction conditions on the dryer condition, so the tenacity for liquefaction should also be noted.