Abstract
It is difficult to evaluate the characteristics of volcanic ash soils accurately by indexes which represent properties of the soil. There are also no available indexes to evaluate the frost-susceptibility of volcanic ash soils. In this study, we carried out various physical property tests and frost heave tests for 47 kinds of volcanic coarse-grained soils distributed widely in Hokkaido. It was revealed that a lot of vocanic ash soils evaluated as frost-susceptible by the conventional iginition test are not frost-susceptible by a series of these test. We also showed that the frost-susceptibility of volcanic ash soils could be evaluatued easily based on the relationship between the natural water content and the optimum water content of them.
