Effects of compaction conditions on undrained strength and arrangements of soil particles for Shikotsu volcanic soil

摘要

In order to prevent ground disasters on volcanic soils, the mechanical properties have to berncleared in detail. In this study, the mechanical characteristics of a volcanic soil which has deposited in Japanrnwere investigated by a series of laboratory tests. The arrangements of soil particles of the compacted specimensrnwere also observed with a microscope. Based on the test results, the effects of compaction condition, such asrnthe differences of water content, on the undrained strength was discussed. From the results of cross-sectionalrnobservation, it was found that the trends of arrangements of soil particles were influenced by the water content atrncompaction work. Finally, undisturbed specimens were sampled on the site of a failed slope, and their undrainedrnstrength and soil structure discussed in this study.