Abstract
This study aims at revealing characteristics of particle breakage for volcanic coarse-grained soils mainly formed from pumice particles. In order to examine changes in void structure due to particle breakage, a series of the creep test using triaxial apparatus was performed on two kinds of volcanic coarse-grained soil with different crushability. An estimation method of void structure for volcanic soils was proposed based on a void model. Test results showed that existence of both inter-particle void and intra-particle void was clearly observed in the volcanic soils, especially the amount of the intra-particle voids had an influence on the creep behavior. It was also indicated that the particle breakage characteristic depended strongly on intra-particle void ratio with the opening, thereafter the closing intra-particle void ratio decreased with the progress of creep.
