黒富士火砕流の土質工学的特性について

概要

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Soil engineering properties of Kurofuji pyroclastic flow deposits which are locally distributed in the northern region of Yamanashi prefecture are investigated. First, the physical and the chemical properties and the shear characteristics are examined through the various tests and the following characters are found out : Comparing with Shirasu which is notorious for the source of the soil disasters in southern Kyusyu and whose origin is geologically similar to that of Kurofuji pyroclastic flow, (1) The content of volcanic glass is less; (2) The degree of weathering is smaller; (3) The bonding of structure is greater. Secondly, the mechanical tests on compacted samples are carried out. The results indicate that soil particles are severely destroyed by compactive efforts and the shear strength greatly decreases when water permeates the compacted mass. Finally, an index of hardness is introduced based on the results of a sounding test and a trial method for estimating the stability of the high cliffs which can be familiarly found in the field is proposed.
山梨大学の論文