ABSTRACT
This paper aims to reveal liquefaction properties of volcanic soils with non-plastic fines under various consolidation histories. A series of cyclic undrained triaxial tests was conducted on reconstituted specimens of Pumice and Shirasu with varying specimen density and overconsolidation ratio. On the basis of the test results, the following results were obtained: (1) The liquefaction resistance of normal consolidated Shirasu with fines at relative density of about 50% and 70% becomes lower than that of Toyoura sand. (2) The variation in liquefaction strength can be expressed as Rs=(OCR)m. The m values of Shirasu and Pumice with non-plastic fines is greatly higher than that of Toyoura sand. (3) The increase of cyclic strength for volcanic soils with fines due to overconsolidation is caused by fabric and density changes and bonding effect which is introduced by non-plastic fines.
